Biolizard

Before the events of the games…
Biolizard was created as an Ultimate Life Form prototype as part of Project Shadow. The goal of the project was to create an eternal, perfect life form with enormous power to protect humanity from all threats. The creator of Biolizard, Professor Gerald Robotnik, hoped to find a cure for his terminally ill granddaughter Maria Robotnik while researching eternal life. However, Biolizard was a failure – he was almost incapable of moving and living on his own, for his limbs were very weak and he would die without a life-support machine. However, Biolizard possessed monstrous strength and was able to use the power of Chaos Emeralds to teleport – Chaos Control. However, Biolizard’s greatest flaw was that he possessed no emotions or soul, which was categorically unacceptable to Gerald Robotnik. Gerald believed that the only way to create such a powerful being friendly to humanity was to give it emotions and a soul.

In the end, the project was successfully completed with the creation of Shadow the Hedgehog, the final version of the Ultimate Life Form, while Biolizard remained on the colony and artificially sustained life. Soon after, the government learned of Project Shadow and organized a raid on the colony. During the raid, many researchers were killed, all projects (including Biolizard) were archived and Gerald Robotnik himself was taken prisoner. During the raid, Maria Robotnik was also killed, which drove Gerald mad. Unable to control himself, Gerald created a plan to destroy humanity – he altered Shadow’s memories in such a way that Shadow believed that the last promise he made to Maria was revenge against humanity. Likewise, Gerald ordered Biolizard to fully facilitate the plan to destroy humanity. The plan was to install seven Chaos Emeralds on the colony, the energy of which would bring the colony down to Earth and destroy all life on it.

Sonic Adventure 2 (2001)
Fifty years later, Gerald Robotnik’s grandson Dr. Ivo Robotnik aka Eggman found Shadow at the GUN base and freed him from his 50-year sleep. Shadow tricked Eggman into helping him collect the Chaos Emeralds and together they successfully placed all the Emeralds on the colony and it began to fall to Earth. Realizing his mistake, Eggman, supported by Sonic the Hedgehog, Knuckles the Echidna, Miles “Tails” Prower and Rouge the Bat, tried to stop the Chaos Emeralds with the power of the Master Emerald, but Biolizard stood in their way. Suddenly, with the help of Amy Rose, Shadow recovers his true memories and learns that his real promise to Maria was to give people hope, so Shadow faces Biolizard in battle and wins. However, Biolizard had no intention of giving up. After losing his life support machine in battle, Biolizard applies Chaos Control, teleports to the outer hull of the colony, directly onto the Eclipse Cannon and merges with the colony to become Finalhazard. Shadow and Sonic use the power of the seven Chaos Emeralds to transform into Super Shadow and Super Sonic. After a hard-fought battle, they defeat Finalhazard and teleport Colony Ark back to its place. Biolizard’s fate after the battle is unknown, but he was probably either killed by a hedgehogs attack or died without a life support machine, so the odds of Biolizard surviving are next to nil.