From Terrorcon_King:
"After Megatron came into the Animated Continuity, he figured if he wanted to rule this universe [then] he would need solders. At that point, he used the time space portal to retrieve Terrorsaur [Terrorsaur] wasn’t his first choice, but he needed him for his “ability” for finding new power sources. Terrorsaur has not changed at all: he's still power hungry and still wants to slag Megatron! But until the Predacons and Decepticons can get both the Maximal’s and Predacons out of the way Terrorsaur will have to obey . . . for now at least."
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