The Ultimate Enemy: Part 1

The Ultimate Enemy: Part 1 is the fifty-first episode of Ben 10: Ultimate Alien and the nineteenth episode in the third season. It is the first part of the finale of Ultimate Alien.

Plot
Diagon turns all humans into Flame Keepers' Circle Soldiers.

Major Events

 * Diagon is freed (at the end).
 * Gwen is under Diagon's control for half of the episode.
 * Psyphon returns and is Vilgax's right hand man once again.

Characters

 * Ben Tennyson
 * Gwen Tennyson
 * Kevin Levin
 * Sir George
 * Julie Yamamoto
 * Ship

Villains

 * Diagon
 * Vilgax
 * Psyphon
 * Flame Keepers' Circle
 * Esoterica
 * Gwen Tennyson (Under Diagon's control for half of the episode)

Aliens Used

 * Heatblast
 * Eatle
 * Humungousaur
 * Jury Rigg

Trivia

 * The title of this episode was also used for the Danny Phantom TV movie The Ultimate Enemy.
 * This is Psyphon's 2nd appearance in Ultimate Alien since Reflected Glory.