52
10
10
63 aliens.
10 aliens.
The Omnitrix (the watch-like device he uses to transform into an alien) has 10 aliens at time. But it happened that Ben managed to "unlock" more aliens by collecting their DNA.
ben got his aliens from his watch
15 no 9089576737575894831567676578766666666666666666666666666666666666666666666666666666666666667777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777779883657465745hfh574fh
Ben 10 has more than ten aliens while protecting the earth.
are you kidding i AM Ben ten
ben 10 aliens unleashed or ben 10 evolution
It is assumed he doesn't, as the new aliens are "fusions" of the aliens from the original series.
ben could turn into about 20 because they got new aliens