Ben 10

A series about a boy who found an alien technological piece that allows him be the superhero he always dreamed to be and unlike others, we saw him growth to a teen and later adult, and we know how Hormonal the latter can be, plus with a massive cast with a lot of Female characters, that allow some very unique and sexy Scenarios using such unique cast. From Official Girlfriends to villainesses, alien girls, and relatives. Space is not the limit at all either.

What is the lost episode we find?