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Villain Overview
You may call me... Infinite... in the brief moments that remain to you.
~ Infinite introducing himself to Sonic the Hedgehog.

Infinite is the central antagonist of Sonic Forces and the main antagonist in its DLC prequel Episode Shadow. He is an anthropomorphic jackal who used to be called the "Ultimate Mercenary". After his encounter with and defeat at the hands of Shadow the Hedgehog, Infinite became obsessed with the desire to prove him wrong about being weak. He wants nothing more than to be the strongest until he is never defeated again.

He was voiced by Takashi Kondō in the Japanese version, and by Liam O'Brien in the English dubbed version, who also played Archer in Fate/stay night, Caius Ballad in Final Fantasy XIII-2, Gill in Street Fighter V, as well as Nephrite and Gaara in the Viz Media dubs of Sailor Moon, Sailor Moon Crystal, and Naruto.



Infinite grabbing the Phantom Ruby

Infinite taking the Phantom Ruby from Dr. Eggman and seeing his alleged future.

Infinite was originally the leader of a mercenary team named the Jackal Squad. One day, the squad saw Doctor Eggman in his base with Cubot and Orbot and raided it for its technology. With the Phantom Ruby, Dr. Eggman inadvertantly created Egg Pawn Replicas that he unleashed upon the squad. Infinite still harried on to evade the Egg Pawns and reached Dr. Eggman; however, just when he was ready to deal a final blow, he missed and instead grabbed the newly discovered Phantom Ruby that granted him a vision of the world in chaos. This distracted Infinite and allowed Dr. Eggman to strike him, though the latter gave the former a chance to join him in conquering the world. Despite his teammates protests, Infinite proceeded to join Dr. Eggman in support of making his astute vision become a reality.

Later, Dr. Eggman hired Infinite and the rest of the Jackal Squad to defend his base when it was assaulted by Shadow the Hedgehog. Infinite attempted to attack Shadow out of vengeance for annihilating the rest of his squad, but Shadow effortlessly defeated him, calling him weak and worthless before teleporting away. Enraged and devastated by both his loss and Shadow's words, Infinite was driven to gain more power, eventually fusing with the finalized Phantom Ruby.

Sonic Forces

At the beginning of the game, Infinite debuted inside of a container during his experimentation by Dr. Eggman. After mentioning his burning hatred of Sonic, Dr. Eggman gloated over Infinite in his process and reveres him as his unstoppable creation.

In Episode Shadow, which was set one month ago, Infinite was completed and dawned a mask to obscure his face. He later crossed paths with Shadow again after he had dealt with E-123 Omega, who had previously fought through Dr. Eggman's base. After reminding the black hedgehog of their last encounter, Infinite then unleashed his powers to trap Shadow in an augmented reality. Although Shadow freed himself from Infinite's control, Infinite became transfixed by his power and inspired to use it in his agenda against Sonic.


Infinite's replicas.

Infinite assisted Dr. Eggman and his robots in an attack on a large urban center. After Sonic the Hedgehog fought off Eggman's forces, Infinite engaged the blue hedgehog, alongside Replicas of Shadow, Zavok, Metal Sonic and Chaos that he had created, and defeated him. Sonic was then captured and brought to the Death Egg to be tortured before being executed.

Infinite assisted Dr. Eggman with his new powers that enabled the Eggman Empire to conquer 99% of the world, being appointed as second-in-command and enforcing fear and subjugation among the populace. Sonic's friends formed the Resistance against them, but they posed no threat to Infinite's prowess.

Infinite and the Rookie

Infinite sparing the Rookie after sensing fear in them.

Infinite one time had wiped out a Resistance squad and faced its sole survivor, the Rookie. Instead of killing them, however, Infinite allowed the Rookie to live after he sensed their fear, though doing so also allowed the Rookie to join the ranks of Sonic's friends and later help rescue Sonic.

Ruby Prototype

The Rookie finding the prototype that Infinite dropped

At the Mystic Jungle, Dr. Eggman dispatched Infinite to destroy a copy of the Phantom Ruby Prototype. While there, Infinite encountered and had a clash against Silver. Infinite instantly defeated Silver with ease-though unwittingly drops the Phantom Ruby prototype in their quick battle-and tried to finish him off before he was interrupted by the arrival of Sonic, whom he discovered was still alive. Although Infinite tried to taunt Sonic with his power during their face-off, Sonic fared better whenever he struck him. However, Infinite defeated Sonic again and decided to spare the blue blur after assuming him as no threat. Soon afterwards, the Rookie investigated the Mystic Jungle and found the same Phantom Ruby prototype that Infinite had dropped earlier.

Infinite later met Dr. Eggman at Green Hill, where he purported the accomplishment on his mission to destroy all Phantom Ruby Prototypes. Dr. Eggman asked Infinite if he had reencountered Sonic. Infinite admitted that Sonic is still alive, but assured Dr. Eggman that the latter was powerless against him. As the jackal then asked to proceed with their plan, Dr. Eggman confirmed that it involved eliminating the entire Resistance. After Infinite left, Tails and Classic Sonic revealed themselves before Dr. Eggman after hearing his conversation with Infinite and chased after the evil doctor. After Classic Sonic defeated him from the chase, Dr. Eggman proclaimed to Tails and Classic Sonic that his plan will occur in three days, before escaping.

Shadow Replica

Shadow defeating his replica before explaining to Sonic about Infinite's powers.

Sonic confronted a Shadow replica to question him after witnessing him aid Infinite and fight against the Resistance, only to be assaulted. Luckily, the real Shadow appeared and defeated his replica before it could land a blow on Sonic. Shadow then explained to Sonic that Infinite has the ability to alternate reality and create replicas of old foes that are formidable as the originals, something of which he had learned from during their second encounter in Episode Shadow when Infinite had observed him in the augmented reality and became inspired to create replicas of him as well.

Reality Powers Infinite

Infinite preparing to unleash his powers among the Resistance.

Meanwhile, the Resistance lead an assault on the Eggman Empire at Metropolis, as they believe that it was their chance to succeed. However, Infinite appeared at Metropolis and unleashed his Phantom Ruby's powers among the Resistance, using his reality warping powers to cause panic and wipe them out. The Rookie managed to escape from the augmented reality and was the last man standing once he encounters Infinite. Infinite tried to intimidate the Rookie like last time, but the Rookie now stands up to him after being reminded of Sonic, whom helped encourage the latter with his words. During their battle with each other, Infinite recognized the Rookie as the Resistance member he had spared earlier (after sensing their very same fear of him from the last time) and decided to finish the Rookie off by summoning several cannons before them. However, once Infinite opened fire, the Rookie avoids the cannon blasts, as they had the Phantom Ruby prototype that counteracts Infinite's powers. Though shocked, Infinite reminded the Rookie that they have two days left until he initiated the plan to destroy the entire Resistance.

Null Space

Infinite unleashing Null Space in hopes of ridding Sonic with it.

After destroying the Phantom Ruby's power source on the Death Egg, Dr. Eggman witnessed its destruction and orders Infinite to follow him to Metropolis. Once Sonic confronted Dr. Eggman there, Dr. Eggman ordered Infinite to unleash a void called Null Space that sucks Sonic into it along with the Rookie, whom followed in to save him. As Tails became confused after they had destroyed the Phantom Ruby's power source, Dr. Eggman revealed to him that he had a backup power source under Metropolis. However, Sonic and the Rookie soon escaped Null Space with their efforts combined and made it back to Metropolis, where they arrived before Dr. Eggman and Infinite. While Infinite was only slightly displeased about this, Eggman furiously had them retreat to the Eggman Empire Fortress.

Sun Virtuality

Infinite creating a virtual sun to end the Resistance.

Once the Resistance Army stormed the Eggman Empire Fortress, Infinite confronted them with an army of his replicas. While facing Sonic and the core members of the Resistance, including the fully repaired E-123 Omega, Infinite created a virtual sun above the entire Resistance army, which Dr. Eggman pointed out will fall and destroy them. Tails soon noticed the Phantom Ruby prototype that the Rookie possessed in hand. Once Tails observed it, he hypothesized that the Phantom Ruby Prototype only reacts to the person whom activated it, encouraging the Rookie to run towards the virtual sun and use the prototype to disable it, though also destroying the prototype in the process.

Infinite disappearing

Infinite fading from existence due to his defeat.

Infinite became weak after his attempt to create the sun, forcing the sadistic warlord to retreat to the center of the fortress with Sonic chasing after him. Once they engaged into battle with each other, Infinite recharged the Phantom Ruby on him and was about to finish Sonic but was then foiled by the Rookie's arrival. The Rookie and Sonic then contended with Infinite head on and defeated the sadistic warlord. Infinite began to fade away due to his defeat, but not before saying that he can still fight, as the jackal headed towards the power source reactor. Infinite's remaining Phantom Ruby core was still intact, in which Sonic and the Rookie chased after. While in pursuit of the fortress' interior, they discover it to be the place where Infinite came to be.


The Death Egg Robot

The reactor was destroyed, but before the heroes could celebrate just yet, Dr. Eggman appeared before them in his Death Egg Robot, revealing to them that the reactor was only a decoy and that he actually had the Phantom Ruby incorporated in the Death Egg Robot, all the while boasting about how he had ostensibly surpassed Infinite with his machine. Using his Phantom Ruby-empowered mech, Dr. Eggman began to conjure more replicas of his army than ever, now consisting of replicas of Infinite.

After Sonic, Classic Sonic, and the Rookie defeated Dr. Eggman and his robot in the end, the entire replica army disappeared along with the Phantom Ruby that was destroyed, presumably ending Infinite as well, since he had bonded with it.

In other media

Super Smash Bros.

Infinite appears in Super Smash Bros. Ultimate as a Primary Attack-type Spirit. His Spirit Battle is a stamina battle against a metal Sonic the Hedgehog while the screen occasionally flips.


There is no reason to resist. Your savior is no more. I can taste you terror, child. All that anxiety and's delicious. Give in to your fear, flee, screaming, and I'll let you live.
~ Infinite attacking a town.
Infinite is a very cruel, sadistic, manipulative, destructive and power-hungry individual who wants nothing more than to become absolutely powerful, which incited the Phantom Ruby being fused into his chest, and his becoming the second-in-command to Dr. Eggman's army. He is a ruthless warlord who has massacred many innocent lives and does not nearly show pity or remorse for it.

Infinite taunting the Rookie.

He is also extremely overconfident, megalomaniacal and arrogant. The powers that he receives from the Phantom Ruby make him confident in himself, stating himself to be the most powerful creature on earth. He harasses weaker, less powerful people like the Rookie, whom he abuses multiple times throughout the game. At the start he offers to spare the Rookie's life if he/she shows fear, probably meaning he would let his victims escape alive if they are afraid of him so they can spread the word of his power and ruthlessness.

He does not only insult the Rookie but also other stronger individuals like Sonic, whom he calls a "filthy rat". Even before Infinite obtained the Phantom Ruby that made him powerful and mighty, he was already sadistic, barbarous and power-hungry by nature. He did, however, have some affection for his subordinates, as he expressed his initial anger at Shadow for apparently destroying them, though this may have mostly stemmed from the fact that he was humiliated that his followers were defeated so easily by one individual, regardless of who they were.

Initially, he was nothing more than a violent mercenary with no regard to any life. In his first meeting with Dr. Eggman, he even wanted to kill him, only to be interested in destroying the world when Dr. Eggman gave him the offer to join him in his goal. Despite his extreme arrogance, Infinite is actually cold and calm at almost all times. Even when he loses, which is something he absolutely hates doing, he simply gets shocked and starts talking to himself, but does not otherwise lose his temper. His dialogue is much more theatrical, subdued, and certainly more menacing, probably showing that he loves to taunt his victims just as much as he loves killing them.

Perhaps his biggest weakness, besides his arrogance, is his inferiority complex, as shown after his defeat by Shadow the Hedgehog, where he throws a tantrum because he realized that he was afraid of Shadow. This would culminate his desperation of ultimate power by gaining the Phantom Ruby for himself and becoming the sadistic warlord he is today. Also, he tries to make himself so powerful that no one, not even Sonic or Shadow can defeat him, and continually tries to prove to himself and others that he is not weak. This could be a sign of insecurity, egoism, or just another form of his arrogance.

Powers and Abilities

Before being weaponized, Infinite was a highly skilled mercenary. He is proficient in sword-fighting and has sharpened reflexes. His base agility is also higher than average, being able to traverse an entire jungle in a few leaps. However, he was utterly no match for powerful individuals like Shadow the Hedgehog.

The Phantom Ruby

The Phantom Ruby

After obtaining his synthetic Phantom Ruby, Infinite gained the ability to create an augmented reality that achieves form through his imagination and the psyches of his victims. By simply willing it, Infinite will generate a field that allows him to control the movements of his enemies through a gas called "Ruby Mist". While in this field, he is also able to generate whole facets of reality such as people, landscapes, weapons and atmosphere. The field itself has an estimated range of around a 10-mile radius, in which he can do essentially anything to his enemies with absolute precision, regardless of his conscious effort.

The Phantom Ruby's augmented reality constructs are as powerful as their originals and Infinite is able to selectively remove their effects on reality in any way he chooses. When generating a star with which to incinerate the Resistance, Infinite withheld the sun's gravity and atmospheric range to avoid distorting the entire solar system. When generating replicas of Sonic's past enemies, he removed the personalities of the Shadow copies to make them unreasonable. Whether or not the synthetic Phantom Ruby is capable of creating fully sentient copies or if it merely creates proxies of the original being is unclear. The copies are capable of existing outside of the Ruby Mist field, but they disintegrate if they lose consciousness. Despite having never met Zavok, the Phantom Ruby was able to perfectly replicate his appearance, powers, and personality to the point where Sonic thought he was fighting the original.

At base, the Phantom Ruby's power generates a thin force field around him that can deflect bullets and allow him to fly. Though he does not take advantage of this ability: by placing Ruby Mist clouds in various locations, Infinite is able to teleport by passing through them.

The Phantom Ruby under his control, while powerful, is not stronger than the original. The original is able to fully control its augmented reality with a minimum 50-mile radius. To make up for the glaring flaw of being forced to have the original in-hand, the synthetic Phantom Ruby is designed to be smaller and hands-free. However, the synthetic Phantom Ruby does not generate its own power, requiring an external reactor to maintain the strength and stability of its augmented reality.

"Powers" Debate

Due to translation errors and conflicting ideas in narrative structure, the Phantom Ruby and thus Infinite's powers are labelled as "virtual reality" despite having effects on the real world, which would be called "augmented reality". However, a lack of explanation on the Phantom Ruby's origin and full capabilities makes it entirely possible that the Phantom Ruby is connected to a form of the virtual realm that has yet to be explored.

Evidence of the Phantom Ruby's power is based in augmented reality: Infinite is capable of generating "illusions" that function in real time and have mass. According to Tails and Dr. Eggman, the Phantom Ruby causes a being to experience and show real pain including lacerations and burns. Psychosomatic injuries are not capable of showing burns or signs of external damage; at the very worst the only signs of injury would be internal bleeding from strained muscles or organ failure due to brain trauma. Infinite is also capable of affecting gravity and Ruby Mist clouds cause beings to teleport. Assuming that these abilities are not generated directly by the Phantom Ruby's source of energy, they would be otherwise impossible to perfectly simulate using virtual reality.

Evidence of the Phantom Ruby's power is based on virtual reality:

There has been no conclusive evidence that injuries and death inflicted by the Phantom Ruby do not just appear as injuries, nor has there been any evidence that any virtual reality construct created by the Phantom Ruby is given illusory mass by the brain's reactions. It could merely be that the psychosomatic trauma is given as illusionary overcoat to further the fact that the Phantom Ruby is a weapon, and the illusions it creates do not wear off after a victim dies. Otherwise, it is possible that the Phantom Ruby is somehow capable of tricking the brain into inflicting real burns and lacerations on the body as a reaction to the illusions. As for the simulations of gravity, it is possible that the Phantom Ruby can trick the brain into thinking gravity is altered while removing any sensations that would indicate being on the ground.

Viewing the nature of the Phantom Ruby's power as a whole, the former is more likely due to the explanations are given in-game and the terminology may have simply been lost in translation.





~ Infinite
Fine, I will teach you fear, then pain. And then...well, at least the fear and pain will end.
~ Infinite to the player's avatar.
I've been looking forward to finishing you and your annoying friends. I trust you're all ready for oblivion? If you're not...oh well.
~ Infinite starting his final showdown with Sonic.
Still thrashing around, I see, you filthy, little sewer rat!
~ Infinite in his first clash with Sonic.
Is there no end to these annoying insects? I will burn your resistance to ashes and you along with it.
~ Infinite preparing to finish off the Resistance army.
Make peace with your fate. Because your lives are now over.
~ Infinite about to kill the Resistance members.
Thanks to this limitless power I've obtained, I have become unstoppable! TAKE THIS!!
~ Infinite trapping Shadow in an illusion.
And the Resistance will yield to the Phantom Ruby's power. All will submit.
~ Infinite to Dr. Eggman.
WHAT?! Who dares!?
~ Infinite meeting E-123 Omega again.
(cackling) The World's most powerful robot is no more a challenge than Crabmeat. As I suspected, this power is without peer... IT IS THE ULTIMATE STRENGTH! Ah, and still more wonderful, a not-so tall, dark, and brooding guest has arrived. I've been waiting for you, Shadow.
~ Infinite's first words when defeating E-123 Omega and meeting Shadow again.
I remember you. You ran from me before, you survived then, but you throw it all away now. Curious, eh?
~ Infinite thinking he remembers the player's Avatar before.
(cackling maniacally) Ah, I suppose you would think so. Ohohoh yes. I am Infinite. You say you do not know me, and yet, I remember you so very well. To you, it was simply another in a long list of Eggman bases you tore down without a second thought.
~ Infinite thinking Shadow doesn't know him.
This wasn't part of my agenda, but I'm always happy to crush a hero. It keeps the rabble in line. Shows them that there is no hope.
~ Infinite facing Silver the Hedgehog.
...nothing. We move on to the plan?
~ Infinite ignoring something he heard.
Seeing is believing.
~ Reply to Silver before finishing him off.
Well, look who's back from the dead. The little blue savior. But what's that I smell? You reek of fear. Glad to see I left an impression.
~ Infinite encountering Sonic for the second time.
Yeah, yeah, I got it. (to Shadow) You... You destroyed my squad. I'll show you why they call me the ultimate Mercenary! Take THIS!!
~ Before confronting Shadow.
More ants to crush. I wonder if this world can offer me a real challenge. And as if to answer, the world sends me a trembling child. Are you going to fight and die here, or run away again?
~ Infinite meeting the player's avatar again.
And with that, the disposal of the Phantom Ruby prototypes is complete.
~ destroying the Phantom Ruby prototypes.
Pathetic little hedgehog. Even with the Phantom Ruby weakened, I still have enough power to smash you into blue jelly. I'll show you how outclassed you really are!
~ Infinite encountering Sonic for the third time.

No, wait! I can still fight!
~ Infinite's last words after Sonic and the Avatar defeated him.
I'm shaking... Me!? Me... Afraid...!? Urgh. Pathetic!? Me... he's calling ME weak!? No! I am not weak! I'm...I'm not. I'm not weak! I AM NOT WEEEEAAAAAAK! URRRAAAAAAAAAAAGH!
~ Infinite's villainous breakdown after he loses in his battle against Shadow, prior to his transformation.
That day, I gave up my own unsightly face. And I let go of the old me, the one that was so weak so that I could become stronger. And then, at last... I obtained the power. The power to make all yield to my will. I... was... REBORN!
~ Infinite explaining his origin.

Theme Sample


  • It is unknown what Infinite's real name was prior to his transformation by the Phantom Ruby although many fans have come up with the name Zero the Jackal which appears to be the most widely accepted name albeit unofficial.
  • Infinite's face is never seen in the game itself nor the "Episode Shadow" prequel. However, it is shown in the prequel comics.
  • Following his boss battle, Infinite fades away and vanishes, against his own will. It is unknown whether Eggman forcefully teleported him away or if the Phantom Ruby deemed him unworthy and possibly erased him from existence, allowing Eggman to harness its power for his Death Egg Robot.
  • It is strange that Infinite is not attacking Shadow directly in the main game since he hates him well before he meets Sonic. It is also unexplained why Shadow is one of the counterfeit villains Infinite produces if he hates Shadow.
  • Infinite is considered by fans to be one of the evilest villains in the Sonic the Hedgehog franchise alongside Mephiles the Dark (who was also both Iblis and Solaris, his true form), Black Doom, and Erazor Djinn.
  • Infinite is one of the very few antagonists in the franchise who works with Dr. Eggman without betraying him for his own personal agenda, alongside the Time Eater. Unlike Time Eater, Infinite was not brainwashed and had far bigger plans and was far more threatening than Time Eater itself.
  • According to Sonic, Infinite reminds him of the evil genie Erazor Djinn. He was the second villain who called Sonic a rat (the first being was Erazor).
  • Because of the "edgy" (a term used for something that is overly dark) nature of Infinite's character, a lot of people have made fun of the character, even to the point of it becoming a bit of a meme.
    • In addition to this, Infinite is often compared to certain Sonic "OCs" (Original Characters), where they are portrayed as powerful beings with a dark history/nature, mainly due to his design as well.
  • It's possible that Infinite could return in future games as his fate is never specified and the Phantom Ruby is still shown to be active in the Encore mode of Sonic Mania which takes place right after Sonic Forces.
  • Infinite has fought all three members of the Hedgehog trio, Sonic, Shadow, and Silver. He first fought Shadow, who drove him into becoming who he is now. Then Sonic, whom he defeated very easily during their first encounter but was later defeated by him in their final battle. And Silver, only a brief clash but defeated Silver easily nonetheless.
  • Despite being the secondary antagonist, Infinite had more screentime than his boss, as he was the one who drove the plot, committed all of the mass murders and led the attacks on many cities. Plus Infinite is fought three times, while Eggman is fought twice.


            Sonic the Hedgehog logo Villains

Eggman Empire
Doctor Robotnik | Orbot | Cubot | Metal Sonic | Mecha Sonic | Silver Sonic | Mecha Knuckles | Badniks | Tails Doll | E-100 Alpha | E-101 Beta | EggRobo | Eggman Enterprises | MeteorTech | SCR-HD | Master Core: ABIS | Time Eater | Jackal Squad | Infinite | Replicas | Zero

Team Dark
Shadow the Hedgehog | Rouge the Bat | E-123 Omega

Team Hooligan
Fang the Sniper | Bark the Polarbear | Bean the Dynamite

Babylon Rogues
Jet the Hawk | Wave the Swallow | Storm the Albatross

Eggman Nega's Forces
Eggman Nega | Metal Sonic 3.0

Deadly Six
Zavok | Zazz | Zeena | Master Zik | Zomom | Zor

Black Arms
Black Doom | Devil Doom | Eclipse the Darkling

Nocturnus Clan
Imperator Ix

Dr. Eggman | Hard-Boiled Heavies (Heavy King) | Metal Sonic

Sonic Boom
Charlie | D-Fekt | Dave the Intern | Dr. Eggman | Lyric the Last Ancient | Mark the Tapir | Metal Sonic | Morpho | Nominatus | Shadow the Hedgehog | Swifty the Shrew

Babylon Guardian | Bearenger the Bear | Biolizard | Black Knight | Captain Whisker | Carrotia the Rabbit | Chaos | Dark Gaia | Dark Gaia's Minions | Dr. Fukurokov | Erazor Djinn | Fockewulf the Wolf | G-merl | King Boom Boo | Ifrit | Merlina | Solaris | Wendy Witchcart | Professor Gerald Robotnik | Pachacamac

Dr. Robotnik | Agent Stone | Echidna Tribe (Pachacamac)

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