Shredder & Baxter Stockman switch meatballs on some pizzas, used as prizes in a contest, with some weird alien eggs from Dimension X. The Turtles must battle the Xenomorph-like creatures that hatch from the eggs in order to save the city.

The turtles deal with four mutant frogs who are now under Shredder's command and also deal with a group of anti-mutant enforcers.