Kevin Ethan Levin is a Human/Osmosian hybrid and was a team member of Ben's Team. When Kevin first appeared in the original series, he quickly became one of Ben's most notable enemies. However, he reformed in Alien Force, and became one of the main characters. He later joins the Secret Avengers
1990's: Kevin was born.
2007: The events of Ben 10 happens
2012: The events of Ben 10: Alien Force season 1 & 2 happens. He later joins Sliver's Secret Avengers.