Ben 10 vs. the Negative 10: Part 1

Ben 10 vs. the Negative 10: Part 1 is the fiftieth episode of Ben 10.

Plot
The Tennysons pick up the grandson of another Plumber named Cooper who's hitching a ride home with them from summer camp. Meanwhile, a Plumber base at Fort Knox is robbed by the Circus Freaks and Sublimino. By the time the Tennysons find out, they're too late to help, they discover that the Quadrio ignored the gold in the vault and tore into a underground base which Max explains as a Plumbers base.

Max explains that there is a Plumber base built into every major millitary base in the USA. They soon learn of a second robbery at the Seattle Space Needle another secret Plumber Base. Sadly they can't get there in time however Cooper reveals that using his extremely proficient technological abillities he super charged the Rust Bucket's engines which will allow them to make it in time.

Midway to the base Cooper realizes that he didn't make super charged brakes to go with the engine and now they're going to run into Seattle at 500 MPH. At this point Ben as Diamondhead climb onto the outside of the Rustbucket and creates a anchor and attaches it to the Rust Bucket forcefully slowing it down.

At this point the Tennysons discover that this robbery is run by Rojo (having gained a new cybernetic suit), Dr. Animo (who's using a giant mutant bat), Clancy (mutated into a humanoid insect which resembles Stinkfly) and Charmcaster. Grandpa Max discovers that they're 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 the size of 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 meet Cooper.
 * The Negative 10 make their first mission and attack 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
 * Clancy
 * Rojo
 * Sublimino
 * Circus Freak Trio
 * Thumbskull
 * Acid Breath
 * Frightwig

Aliens Used

 * Stinkfly
 * XLR8
 * Diamondhead

Errors

 * If you look closely, when Charmcaster and Gwen are about to face off, the end of Charmcaster's sleeve is purple like normal, but when she waves goodbye before being picked up by Dr. Animo, the end of the sleeve turns pink like the rest of it.
 * When Charmcaster taunts Gwen about not having "taken off the training wheels", she moves her head upward. Note that the lower part of her ponytail falling over her backside does not move as the upper part does, but remains fixed in place.
 * Grandpa Max says Cooper installed an autopilot feature on the rust bucket, but there is one used in the episode Ultimate Weapon.
 * It is unknown how Ben (as Diamondhead) got out of the super-speeding Rustbucket while transforming.

Trivia

 * The Tennysons' (plus Cooper) fourty-fifth stop is Fort Knox, Washington and Mount Rushmore.
 * This is the second time Ben goes to Mount Rushmore, but it's the third time Mount Rushmore is seen because Ben was not with Gwen and Max the first time.
 * This episode reunites Cathy Cavadini and Tara Strong who voiced Blossom and Bubbles on The Powerpuff Girls.
 * This episode is the 2 year celebration of Ben 10.