Ace Killer (エースキラー Ēsu Kirā), is a robotic assassin and a major antagonist in Ultraman Ace. He/It served as the main antagonist of the two part episode “Execution! The Five Ultra Brothers” and “ The Five Stars That Scattered Throughout the Galaxy”; The main antagonist of the 43rd episode of Ultraman Mebius titled “Threatening Mebius-Killer”; a major antagonist in “Ultraman Mebius Gaiden: Ghost Rebirth”, a supporting antagonist in “Ultraman Zero Gaiden: Killer the Beatstar”; a minor character in “Ultraman Ginga”; and a supporting antagonist in “Ultra Fight Victory”. It is a Choju created by Yapool specifically to counter and kill Ace.

Ace Killer returns in Ultraman Mebius, where it is used by Yapool to battle Mebius.


Ultraman Ace

Ace Killer was created by Yapoolt to kill Ultraman Ace. After Ace Killer obtained the powers and weapons of the Ultra Brothersr, Yapool released a robot replica of Ultraman Ace to demonstrate Ace Killer's power by having Ace Killer destroy it.

Ultraman Ace attempted to rescue his brothers, but he was ambushed by the powered-up Ace Killer. Ace Killer easily overpowered Ultraman Ace with the Ultra Brothers' powers, but the Ultra Brothers used the last of their energy to empower Ultraman Ace. With the combined energy of his brothers, Ultraman Ace used a Space Q attack to destroy Ace Killer, freeing his fellow Ultras.

Ultraman Mebius

Ace Killer later returned when it was used by Yapool to combat Ultraman Mebius.

Yapool summoned Ace Killer to Earth to battle Mebius. Ace Killer easily had the upper hand in the fight, and things only got worse for Mebius when Yapool had Gadiba merge into Ace Killer to transform him into Mebius Killer. Mebius Killer brutally beat down Mebius. However, some encouragement from Aya gave Mebius the courage he needed to overpower and defeat Mebius Killer, destroying the robot with the Mebium Dynamite move.

Ultraman Mebius Gaiden: Ghost Reverse

After Yapool was revived he used Ace Killer as a host.

Ultra Fight Victory

Yapool later used Ace Killer again, giving him a copy of Ultraman Victory's UITrans and declaring him Victory Killer. Ace Killer was sent to prevent Ultraman Ace from saving Ginga. Victory Killer was later destroyed by Victory himself and Shepardon.


           Ultraman Villains

Main Villains
Alien Empera | Alien Rayblood | Chaos Header | Commander Black | Dark Lugiel | Dark Zagi | Demon King Jackal | Gatanozoa | Greeza | Gudis | Hellar | Juda | Jugglus Juggler | Maga-Orochi | Radical Destruction Bringer | Reugosite | Sphire | Ultraman Belial | Ultraman Tregear | Yapool

Secondary / Recurring Villains
Ace Killer | Alien Babarue | Alien Baltan | Alien Bat | Alien Guts | Alien Magma | Alien Mefilas | Alien Metron | Alien Nackle | Alien Pedan | Alien Temperor | Alien Valky | Alien Zarab | Antlar | Bemstar | Black King | Deathrem | Doragory | Eleking | Etelgar | Galberos | Golza | Gina | Gomora | Grand King | Grozam | Gudon | Kei Fukuide | Mold | Nova | Red King | Reibotas | Roygard | Sadola | Saki Mitsurugi | Telesdon | Tyrant | Ultraman Orb Dark | Vakishim | Verokron | Zetton | Zogu

Minor / Movie Villains
Alien Bat | Alien Hipporito | Alien Salome | Alien Shaplay | Armored Darkness | Beast the One | Beatstar | Bemular | Black Silhouette | Bogar | C.O.V. | Dark Faust | Dark Giants (Camearra | Darramb | Hudra) | Dark Mephisto | Dark Mephisto Zwei | Darkgone | Delaxion | Evil Tiga | Gan Q | Gomess (S) | Guar | Iaron | Inpelaizer | Jamila | Roberuga | Sandros | Snake Darkness | Zaigorg | Zamsher

ULTRAMAN Manga / Anime Villains
Ace Killer | Adad | Alien Adacic | Alien Bris | Alien Kadder | Alien Nepenthes | Alien Pedan | Alien Robuton | Alien Woovelve | Bemular | Leo Brothers

Ace Killer Squad | Alien Union | Belial Army | Belial Galactic Empire | Dark Giants | Darknes Five | Empera Army | Four Heavenly Kings | Guar Army | Hellar Army | Planet Invasion Union | Reionics Hunter | Star Cluster Council | Star of Darkness

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