An old enemy emerges while Ben and Rook visit Gwen and Kevin at college.
Ben and Rook must stop Zombozo and the Circus Freaks from turning everyone in Bellwood into zombie clowns!
Grandpa Max's old Plumber partner, Phil, seeks Max's help to tame the monster within.
Ben and the plumbers work to stop Ultimate Albedo's take over of the galaxy using Azmuth's absorbed intelligence.
Rook and Grandpa Max search for Ben who is being held by Khyber on a private alien hunting preserve.
Ben worries that a casual conversation with Derek could potentially cause issues for Bailey, Cristina turns to Shane as tension grows with Meredith, and April’s upcoming wedding makes for an uncomfortable situation between Jackson and Stephanie. Meanwhile, Meredith plans a Thanksgiving dinner at her house.moreless
Albedo seeks a device that will finally change him back into his Galvan form; meanwhile, Ben is locked in Plumber HQ prison.
A flashback from 5 years ago details how Dr. Animo nearly took over Mount Rushmore.
With Plumber agents trapped in Incursean territory, Ben and Rook must employ the services of Rad Dudesman, the roughest, toughest smuggler in the galaxy.
The Incursions invade Earth, and the alien population of Undertown is revealed to the world.
Earth has been conquered by the Incursions, and Ben has been banished from the planet. A resistance cell led by Rook, Kevin and Gwen fight to overthrow the Incursions.
Ben and Rook have to escort Vilgax to a maximum-security prison planet along with defending the Earth against the Incursion armada.
Galvan B is destroyed. Ben must deal with a past failure; a deranged Malware launches his final attack in order to obtain the immeasurable energy and power of the Omnitrix and kill Ben once and for all.moreless
The Faction infiltrates Galvanic Prime.
Ben meets an alternate version of himself while searching for a 23rd Mr. Smoothy's store.
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.
Billy Billions turns Ben and Rook into kids again.
Khyber attacks Ben and Rook at a festival.
Blukic and Driba arrive at Mr Smoothy to try the new flavor, while Rook and Ben fight Trumbipulor.
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.moreless
Rook and several Plumbers are accidentally transformed into other aliens when a part of Ben's Ominitrix is stolen during a prison break.
Ben is not deterred and continues to fight to the best of his ability.
Khyber and his Omintrix possessed pet have been testing Ben's skills and gathering information. They now use their collected knowledge to finally face Ben in battle.
Ben and Rook discover that Argit and the Vreedle brothers have stowed on board an alien space vessel.
Ben's old enemy Dr. Animo returns to confront Rook.
Khyber the Huntsman infiltrates a facility to download information on Ben Tennyson's experience with a deformed Mechamorph named Malware. He learns of Malware's creation and destruction, as well as Malware's search for a Helix.moreless
Ben encounters an old enemy from his youth, the Megawhatts. But this time, they need his help in freeing them from their capture.
With his new partner by his side, Ben investigates Undertown in search of clues. Once there, he learns that Vilgax's old lackey Psyphon is causing trouble.
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.