Ben 10 Omniverse Crossover Idea

While Ben and Rook are sent on a Mission to hunt down a rogue Celestialsapien, their ship is attacked causing it to malfunction as they get hurled towards the planet below.

After regaining their bearings, Rook discovers they’ve landed upon a planet that is unknown to Plumber HQ. Ben seeing the possibility to unlock a new undiscovered alien species and sample its dna, runs out of Rook’s ship as he sets out to find one.