And Then There Was Ben

And Then There Was Ben is the fifty-second episode of Ben 10: Omniverse.

Plot
Professor Paradox unites the good Bens from across all dimensions to take on Vilgax, Eon, and the evil Bens in the ultimate showdown!

Major Events

 * Good Ben and Professor Paradox restore the multiverse
 * Big Bug, Vomit Man, and Eye Guy make their debuts.
 * Good Ben finds out that his timeline's Grandpa Max is a Plumber.
 * Kenny makes his Omniverse debut.

Characters

 * Good Ben
 * Ben Tennyson
 * Professor Paradox
 * Ben 10,000
 * Ben 23
 * Gwen 10
 * Argit (alternate timeline; cameo)
 * Jerry (alternate timeline; cameo)
 * Bromeba (alternate timeline; cameo)
 * Magister Patelliday (alternate timeline; cameo)
 * Kenneth Tennyson (first re-appearance; cameo)
 * Max Tennyson (alternate timeline)

Villains

 * Vilgax
 * Eon
 * Albedo (cameo)
 * Bad Ben
 * Benzarro
 * Nega Ben
 * Mad Ben (cameo)

By Young Ben

 * Heatblast

By Ben

 * Diamondhead

By Ben 10,000

 * Fourmungousaur
 * Atomic X (2x)

By Albedo

 * Ultimate Echo Echo (cameo)

By Bad Ben

 * Gravattack (cameo)
 * Buzzshock

By Benzarro

 * Frankenstrike

By Ben 23

 * Eye Guy (first appearance)
 * Big Bug (first appearance)
 * Build-A-Guy (cameo)
 * Vomit Man (first appearance)
 * Electricyeti

By Gwen 10

 * XLR8
 * Diamondhead
 * Wildvine
 * Cannonbolt

By Good Ben

 * Grey Matter
 * Cannonbolt
 * Armodrillo
 * Wildmutt
 * Clockwork (2x)

By Nega Ben

 * Gutrot (cameo)

Errors

 * When Gwen first attacks Vilgax as Cannonbolt, her shell is colored yellow instead of blue.

Allusions

 * And Then There Was Ben, along with And Then There Were None, are names parodying the title of the very first episode of Ben 10, And Then There Were 10.
 * So many ways to tell a story but that's what makes them so interesting you could never predict how they go to turn out. Paradox said something similar to what the narrator said in Gwen 10.

Trivia

 * According to Derrick J. Wyatt:
 * This episode is the 200th episode in the whole Ben 10 series in production order.
 * And Then There Were None alongside And Then There Was Ben are special episodes were meant to celebrate Ben 10's 199th and 200th episode ever.
 * Even though this episode is part of the Galactic Monsters arc, it didn't have the Galactic Monsters theme song at the beginning. This was not intended by the producers.
 * In one scene, young Ben of the Gwen 10 timeline is seen sleeping with a Kenko action figure.