April O'Neil, an ace reporter for Channel 6, investigates recent break-ins, allegedly by Ninjas, which have resulted in the thefts of numerous technologies. However, a chance encounter with a gang of thieves soon leads her to a bigger story when she is saved from the criminals by four Ninja-trained, mutated Turtles. The Turtles take April back to their lair, and, after getting better acquainted, April learns they are good-hearted mutants. They decide to investigate the thefts together, and their efforts lead them into an encounter with the mysterious ninjas, The Foot Clan, and their leader, Shredder. Shredder manages to keep the Turtles from advancing to the Technodrome by flooding the building it is connected to.