Ben 10 Wiki
Omni Icon.png This article belongs to the Classic Timeline
This article is about the episode. You might have been looking for Ultimate Aggregor, the eponymous character.

Ultimate Aggregor is the tenth and final episode of the first season of Ben 10: Ultimate Alien, and the tenth episode overall.


In a desert, Aggregor has Ra'ad in his clutches. Aggregor prepares to take Ra'ad to his ship, but Plumbers arrive to capture him. Aggregor drops his spear and uses his ship's lasers to drive away the Plumbers and gets away with Ra'ad. He puts Ra'ad in a cage with the other captured aliens and attempts to escape, but one of the Plumbers attacks Aggregor's ship, destroying his hyperdrive and preventing Aggregor from leaving Earth.

Ben, Gwen, and Kevin are at Mr. Smoothy, testing out what looks like a new smoothie flavor (lamb and sardine), which Ben seems to like. However, their hanging around is over when Ben's fans come to harass him. Ben transforms into Big Chill and then into Ultimate Big Chill and blocks away the fans with his flames, which soon turn into ice.

They see a Grandpa Max hologram on the Ultimatrix and go to the desert where Aggregor and the Plumbers fought. Kevin breaks down the crime scene in a CSI like fashion, accurately recreating the skirmish between the two sides, which shocks the others. They take the Rust Bucket 3 to find Aggregor's ship. Gwen and Kevin talk, with Kevin shutting Gwen up with a kiss on her cheek.

They find Aggrebots and fight them. Ben transforms into Lodestar during the battle and the team defeats the Aggrebots. Lodestar decides to use his magnetic abilities to stop the ship, but it explodes, presumably killing him. Gwen manages to protect Kevin and Max from the explosion and thinks that Lodestar was killed, but he recreates himself.

The group flies the Rust Bucket 3 to the base where they met Bivalvan. During the approach, they are escorted by a few Northrop Grumman F-14 Tomcats. Ben introduces Colonel Rozum to Max, but he already knows Rozum. They wonder where Aggregor is and they find out that he is at the Los Soledad military base. Aggregor finds Professor Paradox's time-travel machine, which he is going to use as a power source to absorb the other aliens' powers. Rozum wants the team to get rid of Aggregor from Los Soledad or he will have to destroy the base with a bomb. Paradox then arrives, and explains Aggregor's use of his time machine.

Colonel Rozum gives them permission to stop Aggregor and Paradox leaves, but Rozum will still keep his orders. The base is guarded with Aggrebots, so they fight, with Ben transforms into Swampfire then into Ultimate Swampfire immediately after. Aggregor releases Bivalvan, Galapagus, P'andor, Andreas, and Ra'ad, but takes control of their minds and makes them attack Ultimate Swampfire and the team.

A fight is engaged between the team and the aliens. Max releases Bivalvan from Aggregor's control by charging his forehead into a wall, destroying the head piece, but he teleports away. When Ra'ad squeezes Ultimate Swampfire, he transforms into Nanomech and shoots Ra'ad's head piece, and he disappears too. After that, Kevin jumps to release himself from Andreas, who was sitting on him and shaking him. Kevin pounds Andreas' forehead. Then the screen moves to Gwen fighting Galapagus, who is blowing air to her. Gwen shoots her mana to Galapagus, but he is immune to her attacks. Gwen creates one more mana beam and shoots it into Galapagus' back. Galapagus falls down, then P'andor prepares to shoot his energy beam when Nanomech shoots and frees P'andor's forehead, with Aggregor teleporting P'andor back. Aggregor then begins to absorb energy and Kevin tries to reason with him, explaining that regularly absorbing energy caused him to go insane when he was a kid (in the original Ben 10 series when he was Kevin 11 and in an Omniverse flashback), but Aggregor doesn't listen, claiming that it is a lie told by powerful Osmosians to control the weak Osmosians.

Before Kevin can reason with him any further, Aggregor shoots Kevin with his spear. He then powers himself up and breaks the fabric of time. Nanomech transforms into Humungousaur and destroys the machine, but Aggregor escapes and the aliens disappear. Aggregor reemerges as being fused with all of the aliens and has become "Ultimate Aggregor."

Noteworthy Events

Major Events

Character Debut

Ultimatrix Alien Debuts



Aliens Used



Kevin: I'm going back for a blueberry. Want one Gwen?
Gwen: Please.
Ben: Come on, Kevin. Meat is man food.
Kevin: Meat smoothies aren't man food. A meat smoothie is pretty much the definition of baby food.
Ben: Now that you mention it, I knew it reminded me of something.
Gwen: (Laughs)
Ben: What?
Kevin: You're eating baby food. (Chuckles)
Gwen: You want a bottle with that?

Quotes Right.png


Kevin: Think you can manage not to crash the plane for five minutes?
Ben: I don't know, that's like double my record.
(Kevin leaves and talks to Gwen)
Kevin: What?
Gwen: I've never seen you work on something as hard as you're working on this case.
Kevin: That's bad?
Gwen: Depending on why.
Kevin: Aggregor is an Osmosian, like me. Maybe I just feel responsible.
Gwen: Our responsibility is to Ben. He promise to rescue those aliens and that's what we should be concentrating on.
Kevin: You don't have to tell me what it means to be a Plumber. (shows his badge) This was my dad's badge; now it's mine.
Gwen: I'm sorry, I didn't mean to-
(Kevin kisses Gwen on the cheek)
Kevin: It probably doesn't do any harm to keep an eye on me. I'm not entirely trustworthy.

Quotes Right.png


Colonel Rozum: (about Los Soledad) That facility is under a red seal. If my men can't retake that base, my orders are to destroy it.
Paradox: Now that would be a Major error. Or is that a Colonel error? I'm not very good with rank.

Quotes Right.png


Paradox: In any case, I have other business demanding my attention, even more crucial. A long time ago, in a galaxy far, far away.
Kevin: You ripped that from those movies.
Paradox: I'm a time traveler. How do you know I won't eventually say it first?

Quotes Right.png


Ben: Hey, if you're giving out free future advice, I want some.
Paradox: I could tell you not to lean against the Chronal Randomization Barrier, but I know you won't pay attention.
Ben: Don't... lean against the what?
Paradox: Precisely my point.

Quotes Right.png


Colonel Rozum: Your friends are weird.
Ben: Yeah, we are. Who wants to go save the world?
(Ben, Kevin, Gwen, and Max raise their hands)
Ben: But we're dependable.

Quotes Right.png


Ultimate Swampfire: Easy guys. It's me, Ben!
(P'andor fires his energy laser, and Ultimate Swampfire falls over)
Ultimate Swampfire: ...And you don't care.

Quotes Right.png


Nanomech: Float like a butterfly, sting like a bee!

Quotes Right.png


Kevin: I'd have gone for the off switch myself.
Humungousaur: There's an off switch?
Gwen: Guys! The aliens are gone!
Ultimate Aggregor: (rising) That's because my plan succeeded! The aliens are all in ME!!!

Quotes Right.png

Naming and Translations

Language Name Origin
Hungarian Végső Aggregor Ultimate Aggregor
Polish Ostateczny Aggregor Ultimate Aggregor
Portuguese (Br) Aggregor Supremo Supreme Aggregor
Romanian Aggregor X Aggregor X
Spanish (HA) Aggregor Supremo Supreme Aggregor
Spanish (Spain) Aggregor Mounstro Aggregor Monster


Voice Actor Role(s)
Yuri Lowenthal Ben Tennyson
Ashley Johnson Gwen Tennyson
Teen Girl
Greg Cipes Kevin Levin
Dee Bradley Baker Lodestar
Big Chill
Ultimate Big Chill
Ultimate Swampfire
Paul Eiding Max Tennyson
John DiMaggio Aggregor
Colonel Rozum
David McCallum Professor Paradox



  • Paradox makes a Star Wars reference saying he has business "long ago in a galaxy far, far away."
  • Nanomech quotes a famous line attributed to Muhammad Ali, "Float like a butterfly, sting like a bee."
  • Paradox thinks guns are disgusting things, just like the Doctor on the British science fiction series Doctor Who, who also tends to appear when the galaxy is in danger.


  • When Ben uses Ultimate Big Chill to keep the fans away, the smoothie he set down disappears.
  • Ben, Gwen and Kevin learn that Andreas is still alive. However, they should already know of his survival since they were informed by Ra'ad that he was captured in "Fused".
  • When the team is on the the Rust Bucket 3, the emblem on Ben's jacket has its black and white colors interchanged.
  • Kevin says his badge used to be his dad's. However, Kevin took the badge from Magister Labrid after the latter died in Ben 10 Returns: Part 2.
  • After Lodestar revives himself, Ben tells Gwen "for what it's worth you were right about the trap thing" when Max is the one who said "it's a trap!"
  • Swampfire's hologram faces away from Ben.
  • Before Aggregor puts on his Mind Control Headband, his belt is the same color as his tunic.
  • When the mind-controlled aliens are confronting the team, Andreas' upper arms area is yellow instead of black.
  • When Gwen blasts Aggregor, the Entropy Pump is missing the energy inside it.
  • When Nanomech says the line "You can't beat us all." his mouth doesn't move.
  • Before Humungousaur runs towards Aggregor, the tubes containing the five captured aliens are gone.
  • When Humungousaur strikes Aggregor, his lips are brown.


  • Although this episode was written as the Season 1 finale, Cartoon Network merged the next 10 episodes with this season due to their tight schedule.[DM 1][DM 2][DM 3][DM 4]


T.J. Collins

Dwayne McDuffie

Ben 10: Ultimate Alien Episodes