Deep

Deep is the thirteenth episode of Ben 10: Ultimate Alien.

Plot
Underwater, a Magister Plumber named Pyke (Ripjaws' species) is searching for something. He finds a swimming object which happens to be Ultimate Aggregor who seems to have defeated Pike.

Ben is being surrounded by fans and tries to escape as Goop, but Gwen and Kevin pick him up and save him. Ben receives a message from Pyke on his Ultimatrix about Ultimate Aggregor. They take Kevin's jet to go to Pisciss (Ripjaws' homeworld) to search for Pyke, but are attacked by a monster. They use the electrical gauntlets in their Plumber suits to defeat the monster, but in the battle Kevin's helmet cracks.

With Kevin dying, Gwen gets him absorbing his jet's coating, while a nearby fish is able to convert itself into a helmet for him. Pyke shows up and the kids go with him to find Ultimate Aggregor. Ben's helmet cracks when they battle many sea creatures, and he tries to transform into an underwater alien to stay alive, but becomes Humongousaur instead. With a few moments to live, Ben becomes AmpFibian. They pass the guards once they explain their Plumber business, and go to the core of the planet, where it looks like Ultimate Aggregor is attacking. The core is able to have air in it, and Pyke uses a water helmet to breathe. But a tremor occurs and Pyke is crushed by a rock. While Gwen stays to help him, Ben and Kevin go on, but find Ultimate Aggregor grabbing the planet's core piece that keeps it together.

It turns out the core piece is the second piece of the Map of Infinity, which Paradox did to cleverly disguise it so Aggregor would not suspect. Ultimate Aggregor leaves the core. Ben becomes Big Chill and chases Ultimate Aggregor. Gwen, Kevin, and Pyke have to deal with the core guards. Ben becomes Ultimate Big Chill when the guards keep confusing Ben and his friends as the culprits for stealing the core piece. Ultimate Aggregor, unfortunately, escapes with the piece. Ben, trying to prevent the planet from scattering into pieces, transforms into Goop again, and uses his antigravity device as a substitute, but it also sucks in Goop's body. Soon the planet's surface glows green (Goop's color) and the planet pulls itself back together, with Ben transforming back to himself and being saved by his friends before he drowns. Pyke thanks the kids for their help and Kevin wards off the fish that was used as his breathing helmet earlier (who grew a soft spot for him). They leave and now there are only two pieces of the Map of Infinity Ultimate Aggregor has yet to claim.

Characters

 * Ben
 * Gwen
 * Kevin
 * Magister Pyke
 * Little Fish (friend of Kevin)
 * Piscciss Volann Core Guards

Villains

 * Aggregor

Aliens Used

 * Goop (x2)
 * Humungousaur
 * AmpFibian
 * Big Chill
 * Ultimate Big Chill

Quotes

 * Kevin: Uhh, guys? (his Plumber helmet starts cracking)
 * Ben and Gwen: KEVIN!


 * Gwen: (makes large shield around Ben and Kevin for the Natives)
 * Kevin: What'd you do that for?
 * Gwen: Thought I'd let the local authority handle things.


 * Ben: (Talking into radio) This is Rust Bucket 3, requesting mission to land...d-dive?
 * Kevin: Maybe their communications are out again.
 * Gwen: It could be Aggregor. I'm definitely sensing him on this planet...somewhere.
 * Ben: No point waiting around for an invitation; take us down.


 * Ben: Guys, I need help. (scene cuts to Ben surrounded by screaming fans) I'm surrounded!


 * Ben (after escaping from his fans) Not.even.a.word. 
 * Kevin: No need, I took pictures.


 * Aggregor: Clever of Paradox to disguise this piece of the Map of Infinity as the single most important item on this planet. (Ben reaches for the Ultimatrix) Don't even think about it. If you move, I'll destroy it. And planet Piscciss...
 * Kevin: Comes apart at the seams. The tremors before? That was you trying to get it loose.
 * Aggregor: You're smarter than you look, boy. Admittedly, not a great achievement...


 * Ben: Why wasn't I that cool as Ripjaws?
 * Kevin: You were never that cool, period.


 * Aggregor: Next time, try absorbing something that doesn't conduct electricity! (jumps through ceiling)
 * Kevin: You're not getting away that... AGGREGOOOORR!
 * Ben: You completely forgot about me, didn't you?(in a muffled voice from under the rocks)

Trivia

 * This is the third time that Ben goes alien to get away from adoring fans.
 * Ripjaws was mentioned in this episode when Ben sees the cool stuff Magister Pike (who is also a Piscciss Volann like Ripjaws) does; he asks how come he could never do that as Ripjaws.
 * So far since Ultimate Aggregor, everytime they see him somebody yells out Aggregor's name.
 * When Kevin absorbed the Rustbucket, he should have sunk, but instead he continued to float as easily as Ben and Gwen.
 * This is the second time Ben has to stay an alien so he can survive.The first time is in Map of Infinity.
 * When Goop was repairing the planet, Pyke was seen breathing easily despite the lack of water. Likely because he's older and he still was hydrated.
 * Big Chill/Ultimate Big Chill can breathe underwater.
 * This is the first episode that Kevin absorbs a single type of matter. (This was probably because there was no matter to absorb besides the water.)
 * Odly Ben turned back to Big Chill from Ultimate Big Chill to turn into Goop instead of just turning into Goop.
 * This is the first episode in which we saw AmpFibian with green eyes.