Fredzilla is an alternate form for Big Hero 6 team member, Fred. He first appears in Episode 29 of Big Hero 6: The Animated Series. He was created by accident when Fred accidentally steped on a broken test tube of Kaiju DNA while the team was hunting down a villain who was doing genetic experiments on humans. This event mutated Fred's blood and transformed into a gigantic 300 foot reptilian monster. In this state, Fred then proceeded to go on a rampage through San Fransokyo, destroying all in his path, until he was finally returned to normal by the rest of the team.