In a dark alternate future, an older version of Ben and a young Plumber named Rook Blonko are sent back in time with help from the mysterious Professor Paradox to stop the alien warlord Vilgax from destroying Earth in his pursuit of the Omnitrix, the device that Vilgax and his sister Myaxx created with the great thinker Azmuth. Once he reaches the present day, the future Ben meets up with his past self, and the two have to team up to save the world from Vilgax in both the past and the future. Meanwhile, Gwen befriends a cool older girl named Heather Hope, who helps Gwen discover that she has the potential to become a powerful sorceress, but Gwen is unaware that Hope is actually Charmcaster, who Future Ben recognizes as a minion of Vilgax in the future he comes from who actually kills Gwen. (part 3 of an animated film trilogy)
