3 seasons available
Old George reignites a war against all aliens on Earth.
A Highbreed queen takes over Arachnachimp's home planet.
Vulkanus puts a hit out on Ben.
Julie joins a fanatical group that worships Vilgax.
Negative Ben cashes in on Ben's fame.
The nano-chips disguise themselves as Julie.
The ultimate aliens demand their freedom from the Ultimatrix.
Ben and the team investigate the Pacific Garbage Vortex.
Ma Vreedle wants to use all of Earth's ocean water to spawn.
Vilgax gets Old George's sword and attempts to gain Dagon's power.
Julie becomes a member of a fanatical group that worships Vilgax.
A weapon-master from Techadon wants the Ultimatrix.
Gwen and the gang set out to rescue Charmcaster.
Charmcaster and Darkstar team up to destroy Ben, Gwen and Kevin.
Captain Nemesis captures movie star Jennifer Nocturne.
Dr. Animo comes back.
Albedo tries to get the Ultimatrix by invading Ben's mind.
Ben finds himself in the middle of the final battle between the Forever Knights and Dagon's Esoterica .
Thanks to the return of an old foe, Dagon is getting closer and closer to entering our dimension.
Vilgax returns in his most powerful form.
The team finds an alien girl with no memory.
The team sets out to save Baz-L.
The evil Dr. Viktor returns.
Jimmy saves the gang from an evil alien plant species.
Gwen's cousin visits.
Elena and the nanochips return.
The Forever Knights accidentally unleash an evil force.
Ben and the team go through basic training at the Plumber's Academy.
Gwen has trouble juggling school and her obligations when she has to help Ben and Kevin re-capture Dr. Animo.
Ben 10K visits Ben and company while tracking Eon.
Grandpa Max meets Verdona the Anodite.
The team discovers the hidden truth about Area 51.
Ben's secret identity is discovered; an alien refugee prepares to detonate a nuclear bomb.
Ben comes up with a plan to be in more than one place at once.
With Ben's secret identity out in the open, old enemies attack his family.
Ben's celebrity lands him a starring role in a video game.
Five aliens attempt to escape from a mysterious captor.
A radioactive alien tricks Kevin into freeing him from a containment suit.
Argit has become the leader of the Forever Knights.
Ben is trapped in the form of his newest transformation.
Ben dates a beautiful, young movie actress.
Aggregor's plan is revealed.
The team travels to a bizarre half-frozen, half-molten planet to prevent Aggregor from obtaining a map of the universe.
JT and Cash take credit for Ben's heroic acts.
Ben, Kevin and Gwen travel to an all-water planet in an attempt to capture Aggregor.
Gwen takes the team to a dimension of magic.
Ben traces Aggregor to a mysterious cube-like planet.
Kevin goes insane after Aggregor is defeated.
Ben and Gwen travel to the prison planet to stop Kevin's rampage.
Argit infiltrates the Plumber's Academy with a plan to help the Vreedle Brothers.
After Kevin absorbs the powers of Alan and the other Plumber's helpers, Ben and Gwen argue over how to deal with him; Gwen decides to track down Darkstar.
Ben and Gwen try to bring down Kevin who is loaded with power.