Hulk, because Ben 10 still gets injured by his other enemies, and Hulk is 10 times stronger than the other enemies.
BEN 10
Ben 10 would win because generater rex can use different kind of machines but ben 10 can turn into different aliens.
Guko would win Ben 10th would crush optimus prime with way big but gulp would wipe the floor within 10 Guko will win but Ben 10 would wipe the floor with optimism prime with way big
ben 10 he uses echo echo and kills venom
goten of course idiots
After a long battle, Ben would find an alien that could beat the Terminator.
Ben 10 because Iron Man can not touch Ben as big chill and also he can just turn into Lodestar and control Iron man.
Mario would win because he has made love with luigi xx
herules
ronan the accuser
It would be a savage fight but, ultimately, with his enhanced senses, a Wildmutt would win.
Depends on the version of superman you are using.