The darkest Ben 10 moments saw the characters and the franchise grow up. For this list, well be looking at the moments from the Ben 10 cartoon franchise that featured or implied mature and disturbing themes and content. Our countdown includes Kevin's mutation, Ben loses feedback, Ben thinks Gwen is dead, and more! What do YOU think is the darkest Ben 10 moment? Let us know in the comments!Watch more great Ben 10 videos here: Top 10 Coolest Ben 10 Aliens -