Terrorsaur is one of the Predacons who work forMegatron. He was one of the original six Predacons who stole the Golden Disk. His beast form is a pterodactyl.
Terrorsaur often tried to take over as leader of the Predacons, blowing Megatron to bits at one point, butScorponok repaired him.
When Megatron turned Rhinox into a Predacon, his aggressiveness caused him to attack Scorponok andWaspinator. Terrorsaur was interested in joining up with him and overthrowing Megatron, but Rhinox was not interested in working with him. This caused a fight to break out between Terrorsaur and Scorponok when Megatron sent them after Rhinox.
In Episode 27, "Aftermath", the premier of Season 2, Terrorsaur was killed along with Scorponok when the quantum surge caused them to collide on their hover platforms and fall into the lava pit.