After parting ways with Gwen and Kevin, Ben is assigned a new alien partner named Rook Blanko. Meanwhile, Khyber the Hunstman targets Ben as his next prey.

Rook and Ben find a mysterious alien city under Bellwood after stopping 3 alien crooks: Liam, Fistina, and Bubble Helmet from blowing up Mr. Baumann's superstore in a protection racket.

The Megawhatts that Ben fought in his youth seek his help when they are being used as a power source for the villain Fistrick.

Infiltrating the Plumbers' base, Khyber uploads footage of young Ben's encounter with a corrupted Mechomorph named Malware.

Ben and Rook must stop a giant rampaging alien from destroying Bellwood while dealing with a peace-loving alien-rights activist who doesn't want it hurt.

Ben and Rook attempt to stop Dr Animo and his giant ants.

When Ben and Rook investigate a mysterious alien ghost ship, they discover that Argit and the Vreedle Brothers are fighting for possession of a doomsday device.

Ben and Rook come across elastic, hot blooded aliens that plan to activate a volcano with a nuclear bomb engine.

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.

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.

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.

Gwen and Kevin visit Bellwood. Kevin tells Ben that he must hide himself from The Tetramand Princess Looma as she is hunting him as Looma wishes to marry Kevin.

Magister Patelliday is kidnapped by pirates who rob ships and put them in giant glass bottles to sell them. They intend to devour Patelliday. Any attempts at rescue are hard, since they have a Krakken and a robot army.

Ben and Rook must stop Trumbipulor from gaining absolute power while Blukic and Driba set out to find Mr. Smoothy's.

Ben and Rook are attacked by Khyber at a festival.

Billy Billions turns Ben and Rook into kids again.

Ben and Rook visit Rook's family while Revohnnah is attacked by an old foe.

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.

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

As payment for destroying his car, Mr. Baumann orders Ben to make deliveries for him without using the Omnitrix.

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

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

When the Incursean armada kidnaps the Gourmand Queen, Ben and Rook must get the warring Gormand factions to work together to save her and stop the Incursean invasion.

Ben and Rook escort Vilgax to a maximum-security prison planet, but the Incurseans have other plans.

Dr. Psychobos and Princess Attea have invaded Rook's home planet Revonnah with an army of Incurseans!

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

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

Princess Looma returns to claim Ben as her husband, and she's not going to let anyone stand in her way!

With Plumber agents trapped in Incursean territory, Ben and Rook must employ the services of Rad Dudesman, the roughest, toughest smuggler in the galaxy.

Dr. Animo reminisces about when he once took control of the Plumber's HQ in Mount Rushmore.

The Secret Saturdays come to Bellwood to help Ben and Rook investigate a rash of chupacabra attacks where they've been draining alien lifeforce.

Ben as Gravattack attempts to moderate a fragile peace treaty, but must endure the attacks of tiny alien fleas, which have inhabited his body. Rook shrinks down in attempt to get the fleas off him before the peace treaty is ruined. But it turns out that the Lewodon named Poltroon, sent the fleas onto Gravattack to destroy his core, causing a meltdown in attempt to destroy both the Lewodons and the Appoplexians, therefore causing a war between the 2 species and taking power to destroy his enemies. Now Rook must find a way to change Ben back before they are destroyed and to stop Poltroon.

Octagon and Rhomboid Vreedle kidnap Pretty Boy Vreedle, but when Ma Vreedle finds out he's stolen, but not by whom, she threatens to blow up the sun if Ben and the Plumbers don't find her missing son! Meanwhile Ben tries to hide from his mom so he won't get seconds on the dinner that he hates.

Dr. Joseph Chadwick is back as a Forever King. He is now leading the remnants of the Forever Knights who threaten to erase all alien DNA on Earth as Ben and Rook work to stop the Forever Knights. Jimmy discovers that Will Harangue is somehow involved in Joseph's plot.

Ben, Gwen and Cousin Lucy try to find out how Psyphon's thugs are getting Plumber technology. Gwen suspects that Lucy is the mole because of all her shape-shifting abilities, and her love of tricks when she was younger.

Kevin, Rook and Argit run into OTTO, an old enemy who tricked Kevin and Argit by stranding them alone in the Null Void. While attending an intergalactic auto show on Khoros, OTTO and Violent Offenders end up stealing some of the most expensive cars, and its up to the gang to stop them with some help from Ben.

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.

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, Rook, and Grandpa Max have their hands full when Phil returns as a half-human, half-Terroranchula creature and starts absorbing all of the electricity and lightning in Bellwood. Phil seeks Max's help to tame the monster within.

Ben and Rook must stop Zombozo and the Circus Freaks from turning everyone in Bellwood into zombie clowns!

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

Vilgax's former lackey Psyphon is elated when his master returns.

Ben and Rook are called to London to investigate the Forever Knights' latest activities.

Dr. Animo from the future comes back to the present to help himself defeat Ben once and for all.

Ben and Rook enlist the help of intergalactic smuggler Rad Dudesman to fly them through the Anur System-the home of the monstrous aliens.

Still stranded on the monster planet Anur Transyl, Ben and Rook reluctantly team up with Charmcaster to take on Zs'Skayr.

Ben, Rook, Hobble and Rad Dudesman come face to face with the evil Lord Transyl, a vampire-like alien who can make anyone his loyal slave.

The princess Looma and Attea are at odds over who gets to marry Ben.

Ben finally meets the ones responsible for his intergalactic TV show, and the actor who makes Ben 10 more famous than Ben himself.

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.

Billy Billions, Kangaroo Kommando, and Captain Nemesis team up to take down Ben, and claim his place as protector of Bellwood?!?

Psyphon and a gang of bounty hunters are after Argit, who is in possession of a dangerous weapon.

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.

A mysterious Galvan arrives and demands Blukic and Driba to give back a super powerful weapon needed to stop a threat to Earth.

Rook is under the influence of Fistrick's "bro" essence, and starts to act like a bro. Can he and Ben infiltrate an alien fight club to claim the Golden Fist?

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.

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?

Ben's country cousin Clyde Fife wants to become a hero like Ben.

Master Kundo, Rook's former teacher is willing to save Revonnahgander traditions at any cost by preventing Rook's sister, Rook Sharr from going to the Plumber Academy so she wouldn't be able to become a Plumber.

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.

After Mr. Baumann, the grouchy storekeeper, realizes from Ben that his temper comes from being lonely he starts soul-searching. Eventually he stumbles across a secret not from this earth.

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.

Fistrick orchestrates a series of robberies while wearing ID masks programmed to make him and his compatriots to resemble Ben. When the real Ben discovers what's going on he decides to go undercover with Rook's help and investigate Fistrick's workout gym to find out what's going on. As this is all happening, Ben is struggling with his obsessive cravings for chili fries and meatball subs.

With the help of the con-artist Simian, Argit starts a secure transport firm called "Argistix Securities" employing a group of Techadons as workers. Ben immediately becomes suspicious of Argit's business, considering the latter's history.

Pa Vreedle reunites with Ma for all-out, total cosmic destruction! Meanwhile, Rhomboid and Octagon tries to impress Ma and Pa Vreedle like Isosceles and Parallelogram Vreedle always does.

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.

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

11-year-old Ben, Gwen, and friends go on the adventure of a lifetime in their own backyard.

Khyber, aided by a booger-like Slimebiote named Skurd, attacks Ben & co, but the tables turn when Skurd gloms onto Ben!

Ben, Skurd, and Rook find themselves caught in an endless time loop as enemies from the future converge on Bellwood.

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

Charmcaster traps Gwendolyn in Ledgerdomain to exact her revenge once and for all.

While Rook is stuck on graveyard shift at Plumber HQ, his sensei Kundo returns as a cyborg to purge the galaxy of technological influence.

Ben finally manages to rid himself of Skurd... just when he needs the Slime-Biot most.

Ben fights for his wife on an alien reality show.

The Time War races towards its dramatic conclusion, with the fate of the entire universe and everything in it since the very beginning of time resting in the hands of Ben 10!

Ben and Rook follow Maltruant through the time stream. Ben has an adventure with George Washington, in 1773, fighting Maltruant and Vilgax. After defeating Vilgax, Ben and Rook chase Maltruant in the time stream to the beginning of time itself onto the starship of the Contemelia (the creators of the Annihilaarg) where Maltruant attempts to create a universe of his own using his own Anihilaarg. In a climactic battle, at the beginning of time Ben nearly dies trying to stop Maltruant from building his own universe but then it is revealed that the Omnitrix has a fail-safe to prevent its keeper from dying.