After pretending to be a monster in a nearby lake to scare Gwen, a real lake monster appears. Now Ben is hard-pressed to get anyone to believe him, but not for long.
The group stops in a retirement community to visit Aunt Vera, but Ben finds the aged residents to be quite a bit more physically dynamic than one should ever expect.
Grandpa tries to help Ben by setting up a training area. He also tries to teach him to think about his selections and his moves. In the mean time, Vilgax sends some bounty hunters after the Omnitrix.
Feeling gypped at a boring mid-west tourist attraction, Ben's payback ruins several exhibitions. One exhibit, though, turns out to be a lot more than anyone bargained for when it releases a relentless electrical prankster named Megawatt.
Ben meets a teenager named Kevin in an arcade. He has the ability to absorb any form of energy. They team up, only for Ben to discover that Kevin is only interested in using Ben's Omnitrix to do bad.
Ben's secret fear of clowns absents him from the big top just as an evil soul-sucking clown goes into his act, but Gwen, Grandpa Max and the rest of the town aren't as fortunate.
Following an altercation in a witchcraft museum, Gwen acquires a potent charm that grants enough extraordinary good luck for her to proclaim herself a new superhero - Lucky Girl.
Ben is too short for a ride at a water park, so he uses the Omnitrix to sneak in. An alien enthusiast captures Grey Matter and wants to announce it to the world, so he contacts The Organization, which wants the alien for its own plans.
Ben's cold affects his alien transformations, leaving Wildmutt virtually blind, Four Arms with putrid puss pockets and Heatblast far from able to warm up. Not good when there's a bug-manipulating maniac threatening a city.
Vilgax himself finally comes after Ben. As Ben finds Vilgax to be more than he and his alien selves can handle, Grandpa Max reveals a secret past when he seeks help from a hidden base beneath Mount Rushmore.
The Tennysons encounter Phil, a former Plumber like Grandpa Max. Even though the Plumbers have retired, he still seems to find work that only a Plumber can handle. Is it just coincidence?
Ben discovers a new alien in the Omnitrix. As he tries to figure out the alien's abilities, a meteor crashes nearby. A giant tick emerges. It's already destroyed several other planets. Now Earth is next.
Apparently, Ben's aliens have been creating havoc across the country. Have they, really? As Federal agents come gunning for him in San Francisco, Ben gets the lowdown from a former friend.
In a what-if tale, Ben wakes up back at the start of summer vacation (with full memories of the coming weeks) and finds himself not the one to whom the Omnitrix affixes itself.
Ben is enthralled as a team of galactic superheroes trail two supervillains to Earth who are looking for the other chemical half of a solar-system-destroying explosive.
Being special guests at the first underwater resort excites Ben and Gwen till they meet the owner's snobbish grandson and a plethora of vicious undersea aliens.
Despite Gwen and Grandpa Max's warnings over toying with the Omnitrix, Ben messes around with it until - oops! - he breaks it and his aliens start coming out as fused hybrids.
Ben manages to unlock the master code on the Omnitrix, allowing him to change at will. It comes in handy now that Vilgax and Kevin 11 are teamed up and coming for him.
Gwen and Ben find themselves abducted into the future in order to help their future selves with a problem, but Dr. Animo keeps them busy by reanimating Vilgax.
While traveling through Death Valley, the Tennysons come across a winterland anomaly, where Grandpa Max is forced to become Santa Claus and the kids start becoming elves.
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What is the Japanese language plot outline for Ben 10 (2005)?