The Tennysons pick up the grandson of another Plumber, Cooper, who is hitching a ride home with them. Meanwhile, a Plumber base at Fort Knox is robbed by The Circus Freak Trio and Sublimino By the time the Tennysons find out, they are too late to help. They soon learn of a second robbery, this one run by Joey having gained a new cybernetic suit), Dr. Animo, Clancy (mutated into an insect), and Charmcaster (without Hex). Max discovers that they are searching for the keys to the "Sub-Energy" an extremely potent sub-atomic power source given to the Plumbers by an alien race. they lose the keys to the villians, and attempt to route them at the Mount Rushmore base, where the Sub Energy is stored. However, they find that the Forever King joined by a subordinate and the villains that raided the earlier bases, has beaten them to it. He dubs his team the Negative 10 and sets them upon the Tennysons.

Cast and Crew

Stars

Recurring Roles

Guest Stars

Notes and Important Points

• Alien forms used by Ben: Upchuck, Eyeguy, Wildvine, XLR8, Diamondhead, Stinkfly, Fourarms, and Heatblast.
• First appearance of Cooper.
• First appearance of Clancy as a mutant insect resembling Stinkfly.
• First appearance of the group, the Negative Ten.
• The ten villains in the Negative Ten are: Forever King, Forever Knight Ninja, Doctor Aloysius Animo, The Circus Freak Trio, Joey/Rojo, Clancy, Charmcaster, and Sublimino.

• The Negative Ten may be a refrence to the main character, Ben Tennyson. Ben started out with ten alien forms when he obtained the Omnitrix. He uses the forms to become alien heros. While the Negative Ten, consists of ten villains instead of ten heros.
• At the end of the episode, there will be a sneak peek of Ben 10: Alien Force.
• This is one out of the two final episodes of Ben 10.
• It's a two part episode unlike the other episodes.

Quotes

Trivia

Allusions