~ Protoboy's catchphrase.

Protoboy is a reoccurring villain in Robotboy. He was created by Professor Moshimo in his earlier years. He has many of the same qualities as Robotboy, especially advanced fighting skills, but he lacked Robotboy's humanity. He was stolen by a young Dr. Kamikazi and Constantine. Kamikazi reprogrammed Protoboy and turned him evil, however, Kamikazi made Protoboy too evil and couldn't control him, causing Protoboy to go on a rampage and destroy Kaziland. Protoboy was disconnected by Constantine and placed in a reject closet.

It wouldn’t be until years later that Robotboy, after learning about him from Moshimo, would reactivate him in an effort to turn him good, his efforts proved futile and he eventually defeated Protoboy with a limpet mine, which caused an explosion. However he survived and later returned to get his revenge on his brother and creator.


In the episode "Brother", after hearing about Protoboy, Robotboy, being sad that he had no family of his own, traveled to Kamikazi's lair and reactivated Protoboy, who then began destroying the city. When Robotboy superactivated, Protoboy did as well. Robotboy was nearly defeated until he used the new weapon Moshimo gave him, which is essentially a limpet mine. Which caused Protoboy to explode.

He wasn't seen again (chronologically) until "The Revenge of Protoboy" when he tried to killed Robotboy, Tommy and Gus with an asteroid, after Robotboy destroyed it, he nearly killed him by ripping him apart and would have if he didn’t get a phone call from his "dear". He later tried to sink a cruise ship that Tommy's parents were on, and when Robotboy refused to fight him and tried to get him away from the ship, he captured Tommy implicitly strangled him with his shirt and made Robotboy choose between saving him or the boat to get him to fight. Robotboy manages to save both, then he and Protoboy briefly fight. Robotboy plays possum to make Protoboy think that he destroyed him, he then ripped Protoboy's motherboard out. Protoboy then deactivated and fell into the sea. It is in this episode where it is revealed that he may have a wife or romantic partner.

He returned again in "The Old Switcharobot" when he switched bodies with Robotboy (only ending up with Robotboy's circuits by accident.) This is also the episode in which Robotboy receives his new body. As Brainy Yak destroys Protoboy in Robotboy's old body.

But he returned once more and for the last time in "The Return of Robotgirl" where he tried to destroy Moshimo and Robotboy. He kicked out Robotgirl's batteries and almost defeated all three of them, but was foiled when Robotboy and Moshimo broke free and destroyed the bridge that Protoboy was standing on. Protoboy seemed to have melted in the molten lava he used to try to destroy Moshimo and his brother, but is not shown falling in. Leaving his fate unknown. Protoboy could have been a great brother if he wasn't turned evil. He is stronger than Robotboy but he doesn't get any updates and his smarts is almost as great as Professor Moshimo. Protoboy can be captured while he's turned off and re-programed.


Protoboy is shown to be a cold, emotionless and sadistic killing machine. He takes pleasure in destroying whatever he can and considers it "fun". He is shown to enjoy fighting, as he once said fighting Robotboy would be exciting for him. He almost never shows any emotion other than anger and sadistic joy.

Protoboy can also be calculating and deceitful, as in "The Old Switcharobot" where he swapped bodies with Robotboy in an attempt to be able to kill Moshimo and "The Return of Robotgirl" where he lured Robotboy and Robotgirl to him.


  • He is the most popular villain in the series.
  • He and Bjornbot are the only reoccurring villains to unambiguously die, although they both get revived later on.
  • Writer Robert Mittenthal stated that they may have had an idea to make Protoboy good again if the series continued, meaning that he could have redeemed himself if the show carried on.



           Cartoon Network 2010 logo.svg Villains

Code Lyoko
XANA | Scyphozoa | Men in Black | William Dunbar

TV Movie Villains
Abaddon | Astaroth | Sonny Appleday | Troy Adams | Steve | Big Rob | Whitey | Spinel | Mr. Ross | Future Mordecai | Rigby | Muscle Man | Benson Dunwoody | Grandfather | Father | Senior Citi-zombies | Agent Trout | National Wildlife Control

theCrossover Villains
The Announcer's Remote Control | Delightful Reaper | Alpha | Strike

What A Cartoon!
Yuckie Duck | Sledgehammer O'Possum | Dogg | Big Bad Wolf | Wind Up Wolf | Luther | Fox Chef| French Chef | Tumbleweed Tex | Noof| Mad Bomber | Reilly | Blammo the Clown | Boid | Aliens |

Dexter's Laboratory
Mandark | Quackor | Crazy Robot | Badaxtra | Hookocho | Lalavava | Comrade Red | Mental Mouse | Huntor | Peltra | Simion | Orgon Grindor | Dynomutt X-90

Ed, Edd n Eddy
Kevin | Sarah | Kanker Sisters | Belly Button Eater | Eddy's Brother | Ed's Hallucinations | Lemon Brook Lumpers | Edzilla

The Grim Adventures of Billy & Mandy
Grim | Mandy | Nergal | Eris | Mindy | Bogeyman | Jack O' Lantern | Pinocchio | Geppetto | Cthulhu | Morg | Bunny | Delightful Reaper | Bun Bun | Pan-dora | Hoss Delgado | Hector Con Carne | General Reginald Skarr | Brain-Eating Meteor | Mask of the Beast | Lord Moldybutt | Major Doctor Ghastly | Lionel Van Helsing | Nancy Claus | Estroy | John Jack Daniel Torrance | Wiggy Jiggy Jed | Yaap Yaap | Triceratron | Clowns | Lord Pain | Professor Death Ray Eyes | New Mandy | Super Chicken | Dreadbots | Arachnotaur | Velma Green the Spider Queen

Foster's Home for Imaginary Friends
Terrence | Bendy | Berry | Kip Snip | Lil' Lincoln | Nemesis | Omnizot | World | Wild Mac

Hi Hi Puffy AmiYumi
Axel & Rod Skidmark | Eldwin Blair | Mr. Darrell | Mr. Master | P.A.L. | Rumaki | Sunekura | Sauerkraut Malone | Julie

The Life & Times of Juniper Lee
Auntie Roon | Auntie Roon's Minions | Loki | Thor | Demoness | Jonathan | Kai Yee | Lex | Sandman | Vikki Devvyne | Taylor Evermore | Wrongness

Camp Lazlo
Scoutmaster Lumpus | Edward Platypus | Commander Hoo-Ha | Ms. Mucus | Edward's Brothers | Chip & Skip | Gretchen | Meatman | Timmy and Tommy | Cousin Sinkbug | Aliens | Clowns | Conjoined Pigs | Beastly Bumblepuss | Cheese Obsessed Canadian Trouts | Elebug | Lake Monster

Dr. Kamikazi | Constantine | Special Agent | Bjorn Bjornson | Bjornbot | Protoboy | General Yakitori | Klaus Von Affenkugel | Ludwig | Felonious Hexx | Donnie Turnbull | Kurt | Stu | Mookie | Brainy Yak | Dr. Freeman Coldpepper | Mr. Yaschinshki | Ronald Rump | Robotman | Agent Kalaschnikov | Mona Lethal | Gilbert | Stevie

My Gym Partner's a Monkey
Bobby Lion | Bull Sharkowski | Chad | Euripides Sharkowski | Larry Raccoon | Lola Llama | Possum Girl | Principal Wolverine | Rick Platypus | Mr. Cheetah | The Spiffies | The Ferals | Ted Oxpecker

Miss Endive | Gorgonzola | Reuben | Chestnut | Funjl | Meaches | Gumbo | Mr. Fugu | King of the Sky | Sour Ron | Kevin | Frank | Scary | Puckerberry Overlords | Sour Wife | Rosemary | Cinnamini Monster | Weirdos | Frau Broten | Florentine | Jeffrey | Peking Duck | Jam | Mr. Samball | Robert Limburger | Pepperjack | Flendive | Crazy Fruit | Meanie Cream Cake | Mold Pixie | Steve | The Teriyaki Triads | Roquefort | Ms. Butterscotch

The Secret Saturdays
V.V. Argost | Munya | Rani Nagi | Argost's Army | The Monday Family (Drew Monday, Doc Monday, Zak Monday, Fiskerton Monday, Zon Monday, Komodo Monday) | Abbey Grey | Baron Finster | Shoji Fuzen | Piecemeal | Francis | Eterno | Shock Troopers

Generator Rex
Black Knight | Van Kleiss | The Pack (Biowulf , Breach , Skalamandar, Bouncer, I-Bol & Circe) | Consortium

Annoying Orange
Broccoli Overlord | Broccoli Minions | Grapefruit | Big Rock Candy Monster | Teddy Juicer

The Looney Tunes Show
Cecil Turtle | Yosemite Sam | Elmer Fudd | Marvin the Martian | Wile E. Coyote | Sylvester | Taz | Daffy Duck | Henery Hawk | George P. Dog

Uncle Grandpa
Pizza Steve | Aunt Grandma | Cheesepuff Mike | Bottom Bag | Chinease Take Out Delivery Guy | Christopher Columbus | Cloud Wizard | Curly | Emperor Krell | Evil Forces Shadow Guy | Foreign Madman | Free Sample Elves | Galaxy Guardians | Gary | G-Dog | Gornak | Green Alien | Jimmy | Kevin E. Peepants | Kid Cousin | Larry | Leo | Lexus, Lisa, & Lori | Moe | Mouse | Mole People | Mooon Man | Mud Goblins

Belson Noles | Balance | Brenda Shoop | Joshua | Mildred | Cooter | Malakevin | Carol Moody | Mr. Noles | Seabass

Over the Garden Wall
The Beast | Adelaide

We Bare Bears
Nom Nom | Dave | Ralph | Barry Charles | Wolves | Cory | Ari Curd | Andrew Bangs| Barry's Robots | Techies Club | Pigeon Cartel | Ragtag Kids | Saanvi Patel | Homewrecker | Kyle | Pet Shoppe Owner | Lewis | Lucille | Mad Scientist | Agent Trout

New Looney Tunes
Yosemite Sam | Ivana | Rhona Roundhouse | Carl the Grim Rabbit | Elmer Fudd | Marvin the Martian | King Thes | Cal | Jack | Eagle Scout | Hazmat | Count Bloodcount | Sir Littlechin | Computer Virus | Winter Stag | Krakos the Polar Bear | Scarecrow | Vera the Vulture | Ninjas

Mighty Magiswords
Queen Porcina | Morbidia | Gateux | Phil The Pilefer | Glori | Nohyas | King Rexxtopher | DeBizz | Helmut | Manfish the Fish Man | Frostferatu | Brocoli Dumplin Kids | Brotherhood of Thieves | Francis Thingshooter | Naso | Birda | Purrlance | Mr. Flumooks

Apple & Onion
Beef Jerky | Cheesesteak | Duck | Maritimers (Crab Cake, Tempura Shrimp & Tuna Can)

Craig of The Creek
The King | Maya | Carter Brown | Jason | Junk Lord | Big Red | Brigid | Jerry | Eliza | Jane | Tea Timers | Turner | Cherry Blossom | Acorn Knight

Summer Camp Island
Susie | Alice | Basketball | Jabberwock

Black Hat Organization (Black Hat, Dr. Flug Slys & Demencia) | Penumbra

Infinity Train
The Conductor | Steward | Samantha | Special Agent Mace | Agent Sieve | Marcel | Grace | Simon | The Apex

See Also
Adventure Time Villains | Ben 10 Villains | KND Villains | Ninjago Villains | OK K.O Villains | Powerpuff Girls Villains | Regular Show Villains | Samurai Jack Villains | Steven Universe Villains | Teen Titans Villains | Teen Titans Go! Villains | The Amazing World of Gumball Villains | Total Drama Villains

Community content is available under CC-BY-SA unless otherwise noted.