Plan B

Episode 1
Ben 10,000 warns Ben of an imminent threat. (possible?)

or

Professor Paradox is being hunted by the remnants of Maltruant's army. (possible?)

or

Professor Paradox and Ben 10,000 visit Ben and warn him of a dangerous enemy. (possible?)

or

Ultimate Ben attempts to redirect the timeline.

pr

While on his intergalactic road trip (with Gwen absent due to her college requirements), Ben is attacked by a mysterious enemy that looks oddly familiar. (Who could the enemy be? Eon? Vilgax? Maltruant for some fucking reason?)