Despite being warned by Paradox, Gwen travels back in time to prevent the accident that turned Kevin into a monster from ever happening. Gwen returns to the present only to find that her time traveling caused a series of events that led to Hex ruling the world.

The Plumbers' Helpers receive a distress call from Max, followed by a threatening message from Ben to not interfere. Something's wrong, and the Helpers must face off against their hero Ben.