Ben 10 Omniverse Gn Parallel Paradox

"An attempt to catch a thief who's stealing tech from the inhabitants of Undertown puts Ben and Rook face-to-face with someone from their past whose very existence could mean the end of the world as we know it. To save the universe (again), Ben will have to make one of the hardest decisions of his life. Can he do it before the parallel paradox unravels the very thread of history itself?!"