Ben 10: Alien Force

Season 3, Episode 10

Episode Title: Ghost Town

Air Date: 2009-11-20

Overview:

Vilgax promises Ghostfreak to spring him out of prison as long as he tells him the secrets of the Omnitrix, but when Ghostfreak betrays him and turns his people into his minions, Vilgax comes to Earth and asks for Ben, Gwen and Kevin's help to get rid of Ghostfreak.