Fitor was one of the Guardians under the command of High Protector Cy-Kill in the aftermath of the Renegade revolt. He eventually defected to the Renegades along with his commander, and Cy-Kill's trust saw Fitor rise to become second-in-command of the revitalised Renegades.
After Cy-Kill's departure for Earth to raise an army of Zods, Fitor was left in command of the Gobotron Fortress, instructed to hold out as long as possible against the attacking Guardians. The Fortress eventually fell, while Cy-Kill's efforts on Earth were undone by Leader-1's team. Fitor was then imprisoned on Gobotron's Prison Moon.
He broke out along with Cy-Kill, and escaped to Roguestar. He participated in the Renegades' successful invasion of Gobotron, and then pursued the Last Engineer's Courageous shuttle to Earth along with Crasher and Destroyer. There he observed the testing of the Guardians' new Powersuits, but was detected by Small Foot and then captured by Leader-1.
Presumably he was able to escape Guardian custody again, later leading the Renegade rescue attempt when Cy-Kill was captured by Busar. He would later also come up with another retrieval plan, successfully helping Cy-Kill escape from the Guardian prison planet. Fitor was one of the few Renegades to remain loyal to his leader when Zero attempted to form a breakaway faction, and again when a controlled Leader-1 deposed Cy-Kill as Renegade leader. His loyalty was rewarded when Fitor himself was captured, and Cy-Kill mounted a huge effort to recover him.
Fitor appeared in the following episodes:
"The Battle for Gobotron", "Target Earth", "Earthbound", "The Final Conflict", "Cy-Kill's Escape", "Quest for the Creator", "The Fall of Gobotron", "Flight to Earth", "Return to Gobotron", "Gameworld", "Steamer's Defection", "The Gobot Who Cried Renegade", "Escape from Elba", "Clutch of Doom", "The Third Column", "A New Suit for Leader-1", "The Last Magic Man", "Braxis Goes Bonkers", "Fitor to the Finish", "Doppelganger", "Quest for New Earth", "Et Tu, Cy-Kill", Gobots: Battle of the Rock Lords