Ben 10 vs. the Negative 10: Part 1

Ben 10 vs. the Negative 10 (Part 1) is the fiftieth(50) episode of Ben 10.

Plot
The Tennysons pick up the grandson of another Plumber named, Cooper, who is hitching a ride home with them. Meanwhile, a Plumber base at Fort Knox is robbed by the Circus Freaks 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 Rojo(having gained a new cybernetic suit), Dr. Animo(who is using a giant mutant bat), Clancy(mutated into a humanoid insect which resembles Stinkfly), and Charmcaster. Grandpa Max discovers that they are searching for the keys to the "Sub Energy", an extremely potent, but unstable, sub-atomic power source(the equivalent to the power of 10 suns being concentrated into a golf ball) given to the Plumbers by an alien race. They lose the second key to the villains, and attempt to intercept them en'route to the Mount Rushmore base, where the sub energy is stored. However, they find that the Forever King, joined by a subordinate(a bionic limbed Forever Knight Ninja) and the villains that raided the earlier bases, has beaten them to the base but has yet to gain access. The Forever King dubs his team the Negative 10 and sets them upon the Tennysons.

Major Events

 * Ben and gang meets Cooper.
 * The Negative 10 makes their first mission and attacks Ben and the gang.

Debuts

 * Cooper Daniels

Characters

 * Ben Tennyson
 * Gwen Tennyson
 * Max Tennyson
 * Cooper Daniels

Villains

 * Negative 10
 * Driscoll
 * Forever Knight Ninja
 * Dr. Animo
 * Charmcaster
 * Charmcaster
 * Clancy
 * Rojo
 * Sublimino
 * Circus Freak Trio
 * Thumbskull
 * Acid Breath
 * Frightwig

Aliens used

 * Stinkfly
 * XLR8
 * Diamondhead

Trivia

 * The trio's(plus Cooper) fourty-fifth stops is Fort Knox, Washington, and Mount Rushmore.
 * This is the second time the trio go to Mount Rushmore, but it is the third time Mount Rushmore is seen because Ben was not with Gwen and Max in the first time.