Hoping to fix the Time Window and return home, the Turtles sneak out with Cody and go to O'Neil Tech to meet Starlee Hambrath who works there. However, Darius Dunn sees the guys and wants them away from Cody and in his lab for study. Unleashing old mercenaries against the Turtles, it looks as if Darius will get his wish - until they turn on him and kidnap Cody instead. With Starlee's help the boys use new technology to create new weapons which get a full workout when our heroes stage a desperate rescue mission.