Ben 10: Race Against Time

Ben, Gwen, and Max must stop an extraterrestrial who plans to open a gateway that leads to an alien invasion. Ben Tennyson (Graham Phillips), in the form of Heatblast, confronts and obliterates the villainous Eon, a member of the time-controlling alien species from the planet Chronia. As Eon attempts to activate the "Hands of Armageddon" device, Ben and his friends travel back in time to prevent the gateway from being opened, while Eon reveals that he is an evil version of Ben from an alternate timeline. In the end, Ben and the Plumbers manage to disable the time rift, sending Eon's race back to their dimension, and Ben says goodbye to his Omnitrix.