[Vicky82]

I don't think it will be Chompy because if he starts growing bigger and bigger and Raph start having trouble controlling him then Bishop will have to take him back to his planet or just kill him.

Also as Chompy is an Alien Tortoise he may age and grow very slowly, so he probably be an age as a teenager and hadn't grown that much in 50 years.

Also poor Raph would get the blame for it and I don't think the Raph fans here would like the fact that he's responsible for destroying the earth. There be moaning from them for the next 10 years.