Summary: 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.

Summary: 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.

Summary: 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.

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

Summary: Ben and Rook are attacked by Khyber at a festival.

Summary: Billy Billions turns Ben and Rook into kids again.

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

Summary: 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.

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

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

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

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.