Return to the Past

Ben 10: Star Command Files episode, crossovering with Time Squad.

Story
Otto, Tudrussel, and Larry make a mistake and believe they have to assist the current Ben Tennyson, when they have to help the 10-year-old one. Now the heroes team up with them.

Characters

 * Ben Tennyson (16 and 10)
 * Gwen Tennyson (16 and 10)
 * Kevin Levin (17)
 * Buzz Lightyear
 * Mira Nova
 * Booster
 * XR
 * Otto Osworth
 * Buck Tudrussel
 * Larry 3000
 * Max Tennyson (60)

Villains

 * Vilgax
 * Emperor Zurg
 * Warp Darkmatter
 * NOS-4-A2
 * Kevin Levin (11; mutant)
 * XL

Aliens used by 16-year-old Ben

 * Humongousaur
 * Terraspin
 * Water Hazard (accidental transformation; selected alien was Swampfire)
 * Swampfire
 * Ultimate Swampfire

Aliens used by 10-year-old Ben

 * XLR8
 * Heatblast
 * Grey Matter (accidental transformation; selected alien was Cannonbolt)
 * Wildmutt

Memorable Quotes
Kevin (17): Hey, that's fighting words, you big jerk!

Mutant Kevin (11): You just called yourself a big jerk.

Kevin (17): Uh... shoulda thought about that.

Ben (16): Stand back. I'll handle her with some fire power! (Transforms into Water Hazard)

Water Hazard: Swampfi... mean Water Hazard.

Larry: "Water" Hazard? Yes, that definetly sounds like fire power.

Trivia

 * This is the second time 16-year-old Ben used Ultimate Swampfire to fight alongside 10-year-old Ben, the first time being in the Ultimate Alien episode "The Forge of Creation".