The return of Elena has some unexpected consequences for the gang. Eon's return causes plenty of problems for not just Ben but every Ben. This will see Ben 10 team up with... Ben 10,000! That fight doesnGÇÖt last long however as the Earth is under attack from the Forever Knights and Old George who have started a war with all aliens.
Ben 10 Ultimate Alien: Collection 3
Unexpected Visitors Produce Unexpected Outcomes.