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All of you ungrateful humans who took everything away from me, will feel my loss and despair!
~ Gerald Robotnik.

Professor Gerald Robotnik (プロフェッサー・ジェラルド・ロボトニック Purofessā Jerarudo Robotonikku) is a posthumous antagonist and anti-villain of the Sonic the Hedgehog franchise.

He was a human scientist and the grandfather of Maria Robotnik and Dr. Eggman. Widely acknowledged as one of the greatest scientific minds of all time, Gerald was responsible for several groundbreaking creations, such as the Space Colony ARK, the Biolizard, Artificial Chaos, the Chaos Drives, and his greatest achievement, Shadow the Hedgehog, making him a modern day scientific Da Vinci.

Over fifty years prior to Shadow the Hedgehog, Gerald was asked to lead Project Shadow, a medical program for researching immortality, which he accepted in hopes of finding a cure for a fatal illness afflicting Maria. While Gerald completed the project by creating Shadow the Hedgehog, though not without taking drastic measures, he was taken into custody by the military when his work was deemed too dangerous. When learning that Maria was killed by the military, Gerald slipped into madness and spend his last days plotting revenge at humanity.


50 years ago, Gerald Robotnik was a respected researcher, considered by many to be one of the greatest scientific minds in the world. At the personal request of the president, he was offered a position onboard the Space Colony ARK by the United Federation, who wished to create "The Ultimate Lifeform", a being that could live forever. The military hoped to use the discovery of an "immortality formula" for weapons research, but Gerald refused the offer, believing that they were crossing the moral boundaries of nature. However, upon discovering that his beloved granddaughter, Maria Robotnik, was terminally ill, he changed his mind and accepted the position, in the hopes that he could use the research to discover a cure for her disease.

Many researchers did not believe the creation of an "Ultimate Lifeform" to be possible, and began to name to project 'Project Shadow' due to it's apparently unreachable goal, as well as the level of secrecy the project required. Gerald liked the name, and it stuck.

Professor Robotnik initially experimented on the Chaos Emeralds and researched the results of applying Chaos Energy to living beings. The experiments proved successful and resulted in the creation of the Chaos Drives, which were used by the military as a power source for their robots. He even learned about the history of the Knuckles Clan and the destructive water being Chaos. Fascinated by the legends, he created the Artificial Chaos series and a shrine similar to the one on Angel Island deep within the ARK.

Progressing on the next stage of Project Shadow, Gerald began experimenting on lizards, due to their ability to regenerate limbs; the result was the prototype Biolizard. Initially showing all desired traits as it matured, the prototype required a life support system fueled by Chaos Drives in order to survive, and it lacked to strength to even walk, despite the strength in its tail and neck. Possessing the mind of a primitive animal, the Biolizard became more unruly and difficult to control as it continued growing. With no choice, Gerald had to encapsulate the creature.

Sometime later, Professor Robotnik came in contact with the extraterrestrial Black Doom, and, using his DNA, created a much more advanced being; Shadow the Hedgehog, who became like a son to him and a good friend to his granddaughter. Upon learning that Black Doom and the Black Arms race wished to harvest the human race as food, Professor Robotnik secretly developed the Eclipse Cannon in order to destroy them the next time they visited Earth.

However, the government soon concluded that Gerald's experiments were too dangerous to humanity, and sent GUN to the ARK to neutralize them. Gerald managed to survive, but was immediately captured by the government and sent to Prison Island, where he was forced to continue his experiments. The government used him as a scapegoat, publicly declaring that the Ark had been shut down due to a devastating lab accident he had caused. GUN later managed to capture Shadow and sent him to Gerald, who discovered that Maria was among the casualties of the raid, and was stricken with grief over how his own research claimed the life his beloved granddaughter, despite the fact that it was meant to save her.

Losing his sanity as well as his will to live, he was driven insane and became obsessed with exacting revenge on humanity for betraying his family. He made plans to send the ARK colliding with the Earth and destroy the planet once the 7 Chaos Emeralds were collected, programming Shadow and the Biolizard to ensure his plan's success. Unfortunately for Professor Robotnik, the government feared that Gerald would soon retaliate and had him executed, but not before the mad scientist left one final recording of his execution, in which he explained his plans for revenge.


            Sonic the Hedgehog logo.png Heroes

Main Universe
Team Sonic
Knuckles the Echidna | Miles "Tails" Prower | Sonic the Hedgehog
Team Rose
Amy Rose | Big the Cat | Cheese | Cream the Rabbit |
Gerald Robotnik | G.U.N. Commander | G.U.N. Soldiers | G.U.N. Robots | Maria Robotnik
Team Dark
E-123 Omega | Rouge the Bat | Shadow the Hedgehog
Chaotix Detective Agency
Charmy Bee | Espio the Chameleon | Vector the Crocodile
Babylon Rogues
Jet the Hawk | Storm the Albatross | Wave the Swallow
Sol Dimension
Blaze the Cat | Marine the Raccoon
Coconut Crew
Colonel | Daikun | Kylok | Muzy | Setter | Tabby
Avatar | Caliburn the Sword | Chip | E-102 Gamma | Emerl | G-merl | Lumina Flowlight | Omochao | Princess Elise | Professor Pickle | Shade the Echidna | Shahra | Silver the Hedgehog | The President | Tikal the Echidna | Vanilla the Rabbit | Void | Wisps | Yacker

Classic Universe
Amy Rose | Bark the Polarbear | Bean the Dynamite | Bomb | Heavy | Honey the Cat | Knuckles the Echidna | Mighty the Armadillo | Miles "Tails" Prower | Ray the Flying Squirrel | Sonic the Hedgehog

Archie Universe
Freedom Fighters
Amy Rose | Antoine D'Coolette | Big the Cat | Bunnie Rabbot | Cheese the Chao | Cream the Rabbit | Dulcy the Dragon | Miles "Tails" Prower | Nicole the Holo-Lynx | Rotor the Walrus | Sally Acorn | Sonic the Hedgehog
Angel Island Citizens
Knuckles the Echidna | Relic the Pika | Gixit
Desert Raiders
Sonar the Fennec | Spike the Porcupine | Trevor Burrow the Mole
Chaotix Detective Agency
Charmy Bee | Espio the Chameleon | Vector the Crocodile
Mighty the Armadillo | Ray the Flying Squirrel
Team Dark
E-123 Omega | Rouge the Bat | Shadow the Hedgehog
Time and Space Travelers
Blaze the Cat | Marine the Raccoon | Silver the Hedgehog
Ben Muttski | Coral the Betta | Dulcy the Dragon | Gemerl the Gizord | Honey the Cat | Mina Mongoose | Pearly the Manta Ray | Professor Pickle | Razor the Shark | Remington | Uncle Chuck

Sonic Boom
Amy Rose | Buster | Cyborg Amy | Cyborg Knuckles | Cyborg Sonic | Cyborg Tails | FriendBot | Knuckles the Echidna | Miles "Tails" Prower | Perci | Sonic Cookie Eggman | Sonic the Hedgehog | Staci | Sticks the Badger | Vector the Crocodile | Zooey

IDW Universe
Team Sonic
Knuckles the Echidna | Miles "Tails" Prower | Sonic the Hedgehog
Chaotix Detective Agency
Charmy Bee | Espio the Chameleon | Vector the Crocodile
Time and Space Travelers
Blaze the Cat | Silver the Hedgehog
Team Dark
E-123 Omega | Rouge the Bat | Shadow the Hedgehog
Other Members and Allies
Amy Rose | Belle the Tinkerer | Cheese the Chao | Cream the Rabbit | Jewel the Beetle | Lanolin | Tangle the Lemur | Vanilla the Rabbit | Whisper the Wolf
Big the Cat | Mr. Tinker | Wisps

Adventures of Sonic the Hedgehog
Breezie | Sonic the Hedgehog | Freedom Fighters | Sally Acorn

Sonic the Hedgehog Animated Series
Antoine | Bunnie Rabbot | Dulcy the Dragon | King Acorn | Nicole | Rotor the Walrus | Sally Acorn | Uncle Chuck

Sonic Underground
Knuckles the Echidna | Manic the Hedgehog | Sonia the Hedgehog | Sonic the Hedgehog

Sonic X
Sonic the Hedgehog | Miles "Tails" Prower | Amy Rose | Cream the Rabbit | Knuckles the Echidna | Christopher Thorndyke | Chuck Thorndyke | Cosmo the Seedrian | Rouge the Bat | Shadow the Hedgehog

Animated Film
Sonic the Hedgehog | Miles "Tails" Prower | Knuckles the Echidna | Old Man Owl

Paramount Film
Crazy Carl | Knuckles the Echidna | Longclaw | Maddie Wachowski | Miles "Tails" Prower | Rachel | Randall | Sonic the Hedgehog | Tom Wachowski | Wade Whipple

Ugly Sonic