Board Thread:General Discussion/@comment-24368030-20140112015817/@comment-4974512-20140119124748

I think that in every season, the main villains are those that are the finally in the season, like Vilgax and Kevin in Arc 2 from Ben 10. Zs'Skayr appears in one episode, Transyl appear in one episode, Vilgax in three, like Albedo and Khyber in the Duel of the duplicates, like Malware in Arc 2 from Omniverse.