The Neutrinos return to Earth after hearing in on the plan of Krang and Shredder to get rid of the turtles via brain-drain. Shredder finds interest in their Starmobile's ability to open dimension portals and tries to get his hands on it, and meanwhile the turtles try to get the Starmobile's main energy source running again. Written by
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[viewing news footage of Rocksteady and Bebop engaging in reckless vandalism
I wonder why those two are having such a temper tantrum.
[with his usual sarcasm
Maybe they passed by a mirror and saw what they look like.