Ben and Rook join Kai Green on a perilous alien relic hunt through South America.

Vilgax and Eon team up to wipe out every Ben in every dimension.

Professor Paradox unites the good Bens from across all dimensions to take on Vilgax, Eon, and the evil Bens in the ultimate showdown.

Ben must deal with a past failure; a deranged Malware launches his final attack.

When Eon forces young Ben and teenage Ben to switch minds, only the time-traveling Professor Paradox can sort things out and help Ben stop Eon from taking over the timelines.

The Incurseans take control of Earth, so Rook and the Plumbers must mount a resistance while Ben is missing.

Ben, Rook and Grandpa Max must stop Ultimate Albedo from absorbing all of Azmuth's profound knowledge and taking over the galaxy. Gwen and Kevin show up just in time to help with their struggle.

Ben must deal with a past failure while a deranged Malware launches his final attack on Azmuth.

The Incursean Armada, with the help of Dr. Psychobos, have invaded the Earth.

Ben gets dragged into intergalactic court by the other Celestialsapiens for recreating the universe.

Kevin and Argit attempt to warn the Amalgam kids about the Rooters intentions. Meanwhile, Ben, Rook, and Gwen set off to find Kevin and land themselves in the Null Void.

With the help of Dr. Psychobos, Ben 23 and Ben Tennyson successfully stage a breakout and a revolution in Mad Ben's labor camp.

Albedo, disguised as Ben, seeks a device that will finally change him back into his Galvan form. Meanwhile, the real Ben is locked in Albedo's prison cell at Plumber HQ.

After Ben falls for Albedo's trap, Grandpa Max and Rook search all over the galaxy looking for Ben. Meanwhile he's secretly trapped on Khyber's hidden personal hunting preserve fighting Khyber's new pet that now wears the Nemetrix.

The Rooters have seemingly turned Kevin and the Amalgam kids against Ben. Can Rook and Gwen help him overcome the opposition and escape the Null Void?

A dangerous Chronosapien named Maltruant attempts to obtain total control over the time-space continuum with the help of an old relic called the Key to Time; Ben 23 is sent by the Azmuth of his dimension to Ben Tennyson's dimension in order for the latter to act as a "mentor" to the former.

Ben meets an alternate version of himself while searching for a 23rd Mr. Smoothy's store.

Charmcaster attacks Gwen at Freakin' University, wanting to obtain Hex's mystical Staff of Ages through any means necessary, while Kevin and Rook try to make Kevin's car completely indestructible so that nothing can destroy it.

While trapped in Khyber's ship, Khyber tells Ben that he needs different alien DNA to complete the evil incomplete version of the Omnitrix the Nemetrix. He also reveals that Dr.Psychobos assigned him to hunt down various species for DNA to transfer it to the Nemetrix.

Meet the Rooters, the Black Ops wing of the Plumbers from the Null Void. They've come looking for someone close to Ben, and they mean business.

Ben and Rook are attacked by Khyber at a festival.

An old enemy emerges while Ben and Rook visit Kevin and Gwen at college.

When Ester invites Ben (who brings along Rook to the former's dismay) to a museum exhibit displaying alien artifacts, they encounter Ben's former crush Kai. When Ester discovers their relationship she immediately becomes jealous of her. The four of them are forced to team up, however, when a priceless exhibit that Kai put on display is stolen. Chrono Spanner also reappears again, this time trying to convince Ben that he's "destined" to marry Kai, to Ester's chagrin.

It is revealed that during a fight with Eleven-Year Old Ben Tennyson, Malware touched the Omnitrix symbol on Four Arms. After the battle, he went to Dr. Psychobos and made him create a prototype Omnitrix, the Nemetrix. Back in the present, after a heated argument, Ben and Rook go their separate ways, giving Khyber his best chance to capture Ben.

The Omnitrix begins to malfunction and goes haywire when Psychobos steals a piece of an Omnitrix core causing Rook to mutate into a half-Gourmand and a half-Revonnahgander after Ben 10 attempts to complete a transformation.