Hex, Dr. Animo, Kevin 11 and Vilgax all return with revenge on their minds. Hex seeks to destroy Lucky Girl Gwen in Tough Luck. Dr. Animo has plans to use part of the Omnitrix to mutate the entire world (Dr. Animo and the Mutant Ray). And Kevin 11 teams up with Vilgax with only one goal - to destroy Ben (“Back with a Vengeance”).
Worst of all, Ghostfreak escapes from the Omnitrix and becomes a full fledged being on his own. But to continue to survive, he must merge with Ben’s DNA. Will Ben figure out a way to stop the creature before Ben becomes part of Ghostfreak.