The Turtles set out to prove Dregg's true motives, after nearly getting arrested by military police at Hyper Dyne Labs. The Techno Gang steal a substance called X-Fire, a highly explosive fuel. The Turtles are also still coming to grips with their unstable mutations.

A new foe appears in the form of the time-obsessed Chronos, who has thrown the city into chaos, due to all clocks malfunctioning. Can the Turtles, April & Carter stop him before it is too late?