So Long, and Thanks for All the Smoothies

So Long, and Thanks for All the Smoothies? is the seventh episode of Ben 10: Omniverse.

Plot
When Ben and Rook investigate a mysterious alien ghost ship, they discover that Argit and the Vreedle Brothers are fighting for possession of a doomsday device!

Major Events

 * As well as being the first time Ben does not specifically choose Alien X but uses him anyway, as Paradox once hinted at, Ben used Alien X successfully.
 * Argit and the Vreedle Brothers make their Omniverse debuts.

Characters

 * Ben Tennyson
 * Rook Blonko
 * Bellicus
 * Serena

Villains

 * Argit
 * Vreedle Brothers

Aliens Used

 * Alien X (first re-appearance)
 * Grey Matter (first re-appearance; accidental transformation, selected alien was Rath)
 * Crashhopper
 * NRG
 * Spidermonkey

Trivia

 * This episode accidentally aired in Canada on October 6th, 2012.