You were out at night and you managed to get yourself tangled up with the kraang. You attempt to fight back these aliens, but there where just too many of them.

You feared you would loose the battle and they would end up kidnapping you and experiment on you, but four turtles jumped from the rooftops and took out the kraang for you.

You were relieved but also scared, who were these... mutant turtles?

One of them approaches you (love interest) and ask you if you're okay.

You...

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(This is basic and simplistic and probably wont go anywhere, but we can talk about it and probably turn it into something interesting. This is basically a "you meet the turtles" kind of thing. Hopefully I'll think of better interesting scenarios later on)