you, Sonic, Amy, Knuckles and Tails are friends (or best friends if you want), one day you five were in your house talking with each other and having fun or at least that was untill a random portal appeared in your ceiling and four giant mutant turtle and a human girl falled from it, due to the sudden and strange appaerance Sonic, Knuckles and Amy getted in a fighting stance in front of you and Tails as Amy grabbed her piko piko hammer, the three were very cautious about these five not only because four of them were mutant turtles but also because there was a human and the only human they know isn't very friendly, upon noticing that they were in a different dimension Raph quickly getted up and later Donnie, Leo, Mikey and April did the same, the mobians and the mutant turtles looked at each other for the first time