Primus (Episode)

Primus is the fortieth episode of Ben 10: Alien Force.

Plot
In the middle of fight with a Techadon robot, Lodestar, Gwen and Kevin are unexpectedly transported by the Omnitrix to a planet named Primus. They soon discover that they are not alone and that Vilgax is there to stop the Omnitrix from its source.

After being attacked by various blue alien wasps, Ben, Gwen and Kevin find Vilgax fighting Humungousaur, who turns out to be Azmuth. Also, turning into Rath, Azmuth is defeated by Vilgax.

After capturing Ben, Gwen and Kevin, Vilgax takes the Omnitrix, but can't figure out how to use it. Ben explains it to him, turns him into Goop, and turns off his anti-gravity projector, leaving Vilgax powerless. Ben takes the Omnitrix off him, which immediately turns him back. Ben turns into Cannonbolt and kicks Vilgax into the Codon Stream. Vilgax then absorbs the power from the Codon Stream, which dramatically increases his size and strength. Ben turns into Way Big and, after a short fight, tosses Vilgax into outer space. After rethinking his position, Azmuth allows Ben to keep the Omnitrix.

Major Events

 * Ben and the team learn about Primus and that the Omnitrix is a wireless device that is connected to it.
 * Azmuth and Vilgax used the Omnitrix for the first time on-screen.

Characters

 * Ben Tennyson
 * Gwen Tennyson
 * Kevin Levin
 * Azmuth

Villains

 * Vilgax
 * Psyphon
 * Techadon Robot
 * Zs'Skayr (flashback only)

By Ben

 * Lodestar
 * Cannonbolt
 * Way Big

By Azmuth

 * Humungousaur
 * Rath

By Vilgax

 * Goop

Errors

 * In one scene, Gwen's pants are blue instead of gray.
 * Vilgax's eyes remain white for a moment after he destroys the rocks Azmuth (as Rath) tossed at him.

Trivia

 * Azmuth uses the Omnitrix for the first time on-screen. However, this is not the first time chronologically, as he mentions he's "A little rusty.".
 * While Humungousaur (Azmuth) and Vilgax are en par in strength, in Vengeance of Vilgax: Part 2, Vilgax beats Ben as Humungousaur, even in his giant form.
 * Although it is shown that Azmuth does not intend to forgive Ben, he has forgiven him, but cannot trust him anymore.
 * When Vilgax changes into Goop, he still talks in his own voice.
 * When the Omnitrix came off of Ben and it went on to Azmuth, Azmuth turned into Humungousaur, and he looked like Ben mixed with Vaxasaurian DNA instead of Azmuth's DNA mixed, but when Vilgax put on the Omnitrix, Goop was mixed with Vilgax's DNA and had a different appearance.