April and the Turtles are riding along in the van when a bike messenger cuts in front of them - April slams the breaks just in time! The bicyclist continues on, but suddenly a hand emerges from the pavement and grabs the front tire, sending the rider head first over the handle bars - but the woman lands on her feet with acrobatic flair. Complete Carnage then appears and attacks the bicyclist, who sheds her street clothes to reveal the costume beneath - it's Radical! A fight breaks out amongst the super heroes and the TMNT decide that they'll have to help the woman - so April pilots the van and smashes it into Complete Carnage! The crash sends Carnage through a wall, but he quickly reemerges and knocks Radical unconscious and then flies off with her. April and the TMNT give chase in the van.

Later, Complete Carnage has imprisoned Radical in a cement mixer inside an old factory. The villain plans to seal Radical inside a concrete block and then absorb her powers through it, but before he can begin the process, the Turtles arrive and save the super heroine. A battle ensues, and Carnage uses his ability to pass through walls to good effect, dishing out punishment without receiving any. Eventually CC grabs Radical from behind, but the woman catches the villain's arm and rips it off! Radical then flies to a park (so Carnage can't reabsorb his arm through the concrete floor) and hides it in some bushes. CC is hot on her heels and lands behind her, demanding his appendage back. The TMNT arrive and the fight is renewed. Finally, Radical uses her "particle beam power" and charges Complete Carnage - a huge explosion rips the air, and both super-powered beings are apparently obliterated - only small cement chips remain.

The TMNT gather the remaining shards of Complete Carnage and mail them all over the country to try to prevent the monster from regenerating.