How many Ben 10 episodes are there?

There were four seasons of Ben 10 on TV and in each season there were 13 episodes. So that total of episodes is 4 x 13 = 52 episodes. But then there were shorts, and there were films.

It is in the very first episode that Ben - who is on holiday - finds an alien landing pod, spots the alien artefact that looks like a watch inside. This leaps onto Ben's wrist and won't come off. That's when his adventures begin.