The story of Ben, a typical kid who becomes very atypical after he discovers the Omnitrix, a mysterious alien weapon with the power to transform the wearer into ten different alien species.
With Vilgax's injuries fully-healed, he decides to retrieve the Omnitrix personally. Ben gets a message from Vilgax in a dream about his imminent arrival. This worries Grandpa Max greatly, and he insists that they get to Mount Rushmore as quickly as possible. Unable to pinpoint the exact location of the Omnitrix, Vilgax begins to lay waste to nearby Rapid City in order to flush its holder out. He succeeds, despite Grandpa Max's protests, and manages to capture Ben. Meanwhile, Grandpa Max makes it to Mount Rushmore with Gwen and shows her a huge facility beneath the mountain. There, he's stored a weapon that can defeat Vilgax. Unfortunately, the weapon fails, leading to a showdown between Vilgax and the combined Tennyson family.Watch Now:AmazoniTunes
Ben, Gwen, Cooper and Grandpa Max face their last battle ever against the villains they have encountered and they will battle to get the world's most powerful energy source.Watch Now:AmazoniTunes
The Forever King sets his plan in motion and recruits the most powerful enemies Ben has ever faced in order to steal the world's most powerful energy source.Watch Now:AmazoniTunes
While driving on a Florida highway, a bus of escaped felons rams into the RV. Ben transforms into Stinkfly (though not intentionally) and tries to stop them. With a little help from Grandpa's handy driving, and a magic spell from Gwen, the felons are put back in jail. On the news, the Tennyson's hear about purple lightning delaying a space shuttle launch. Remembering the lightning from the encounter with the werewolf and mummy aliens, they head to Cape Canaveral. At the Space Center, Ben comes under attack by the werewolf and mummy aliens, and new Frankenstein alien. However, why is the purple lightning occurring, and what ties does it have to an old "friend"?Watch Now:AmazoniTunes
A magician named Hex, whose powers come from mystical charms, is defeated by Ben using XLR8 and a little help from Gwen and Grandpa Max. Afterwards, XLR8 takes all the credit for the victory and even gets one of Hex's charms as a souvenir. When Gwen complains that Ben is getting all the glory and recognition, as well as all the cool stuff, he gives her the charm he got from Hex. The charm gives Gwen perfect luck in everything she does, and she becomes her very own superhero, Lucky Girl. Unfortunately, her luck has a price, and Ben is the one who ends up paying for it.
While snowmobiling, two guys accidentally release an alien named Xylene from a strange container. At a park, Ben (as Wildmutt) steals Gwen's kite, so she casts a spell to make dogs attracted to him. Grandpa Max seems sad to be in St. Louis since it is where he met his wife. Xylene attacks, and Grandpa Max comes to defend, only to recognize her. Xylene reveals that she came to find the Omnitrix since she lost it when Vilgax attacked her ship. While Grandpa Max and Xylene talk about the past, a robot emerges from the area where Xylene was and attacks Ben and Gwen. The mechadroid attacks twice, taking Grandpa Max with him. Now Ben must work with Xylene (to his dismay) to save Grandpa Max.
When Ben and Gwen argue over a birthday party to occur in the next few months, Grandpa Max is distracted by their quarreling and almost hits a young boy camper. To ensure the boy's life, they head to Camp Opinicon, only to find no people around. As they investigate the premises, they find twins, whom were also hiding from something that may have a connection to the lifeless camp. Grandpa Max readies to leave the area with the children, only to find that the RV's engine is clogged with a mysterious fungus. While the kids take in shelter in a nearby cabin, Grandpa Max is captured. Now Ben must come to the rescue to discover a new alien form, as well as a way to destroy the evil alien Myceloid Monsters and their Fungal Master, and learn the benefits of what sharing can do.Watch Now:AmazoniTunes
Ghostfreak's return spells disaster for our heroes. Grandpa Max and Gwen must deal with the mummy alien in space while Ben deals with Ghostfreak and Dr. Vicktor on Earth. Ghostfreak then reveals his master plan: he plans to blanket the Earth with Coronium so that sunlight will not reach the planet so that he may rule. With the power of a new alien in the watch, can Ben stop Ghostfreak, and save Grandpa and Gwen?Watch Now:AmazoniTunes
When Ben accidentally breaks Gwen's laptop, he participates in the "Ultimate Wrestling Competition" as Four Arms to get the prize money for a new laptop to replace Gwen's broken one.
With summer over, Ben goes back to school. Unable to tell anyone about the Omnitrix, Ben finds that regular life is much more boring than he imagined. However, the arrival of Vilgax promises to rectify that situation.Watch Now:AmazoniTunes
While camping and swimming at a lakeside campsite, Ben encounters a sea-monster in the lake right after his joke on Gwen. Ben manages to escape, but Grandpa Max and Gwen don't believe Ben about his sighting. The next day, they go fishing and meet their fishing captain, Captain Shaw, who identifies the sea-monster as the Krakken. Throughout this adventure, Ben will meet untrustworthy people, hulking monsters, and he will also encounter his new found form: Ripjaws.
Ben gains another Omnitrix hero to use, which he calls Ditto. Gwen can't stand being around the multiplying Dittos, and they end up giving her headaches. The Dittos, though, prove to be real helpful against Dr. Animo and his multiplying Stinkflies after he extracted some of Ditto's DNA.Watch Now:AmazoniTunes
In a hotel, Ben spots an area where they are demonstrating a new game. He decides to use Ghostfreak's power to sneak inside. He is caught, and Ben, Gwen, and Grandpa Max are kicked out for Ben's misbehavior. After Ben and Grandpa Max argue, Ben decides to wander out into the city on his own. There, he meets Kevin, a sociopath who has the power to absorb any form of energy. However, after Ben reveals the powers of what the Omnitrix can do, he soon realizes that Kevin may only be after the powers of the Omnitrix, for his own doing. Ben learns that there are sometimes where you can't have everything your way all the time.
Hex's niece, Charmcaster, enters the underground prison he's held at to release him out of his cell. With her help, Hex was able to regain most of his powers after being given his magical staff. Meanwhile, Ben, Gwen, and Grandpa Max head to a magic convention held in Las Vegas, and in there, Gwen finds the legendary Keystone of Bazell. With it, she gains the powers of Lucky Girl once again, but will it last after finding out that Hex and his niece are after it?
After the battle with Vilgax, Grandpa Max retells his story to Ben about his past. He was with an organization that was not known to exist, referred to as "The Plumbers," a group of people who track down extraterrestrial life. Meanwhile, they meet Phil, an old partner of Grandpa Max. But they soon find out that he steals a device, called the Null Void Projector, to selfishly use it to make money by appearing to capture aliens that he alone released himself.Watch Now:AmazoniTunes
Grandpa Max takes the kids to Chicago to see one of his favorite band, Shag Carpeting. The kids meet a weather reporter who forecasts the weather with a robot named S.A.M. He uses the robot to create rain, but a giant creature forms! Ben quickly takes care of it. The reporter tries to destroy S.A.M., but he convinces him not to. S.A.M. then goes into the sky and begins to cause chaos. The reporter tries to stop it again, but he is no longer in control. Can Ben destroy the robot and save a city from disaster?Watch Now:AmazoniTunes
When Gwen is abducted, Ben as XLR8 follows her abductor to the future where they discovered that her abductor is the future Gwen and they discover his future version of Ben and Grandpa Max. In the future, Dr. Animo revives Vilgax and plots to open the Null Void chamber. Both Bens must work together to stop them.Watch Now:AmazoniTunes
After dealing with some criminals at a dock, the trio finds their way to a circus run by a clown named Zombozo, much to Ben's chagrin. There, Ben's fear of clowns comes out as they explore. They find a freak show along the way, featuring a trio of mutants with incredible abilities. During Zombozo's show, Ben is too afraid to laugh and ends up leaving. His departure turns out to be for the best, since Zombozo drains the happiness of others to sustain and empower himself. Meanwhile, Ben finds the freaks robbing the town. Ben is able to beat them, but can't bring himself to fight Zombozo. He has to find a way, though, since Zombozo kidnaps Gwen and leaves the entire town in a chuckling daze.Watch Now:AmazoniTunes
After the final school bell rings, Benjamin "Ben" Tennyson is ready to head out for a camping adventure with his Grandpa, Max Tennyson, and unfortunately, his rival cousin, Gwendolyn "Gwen" Tennyson. After the trip to the campsite and the unruly aspects of dinner, Ben wanders out into the forest and meets up with a meteor bearing an alien device: the Omnitrix. The Omnitrix jumps onto Ben's wrist, and he now becomes the wielder of ten different alien superheroes. After experimentation and trouble with robot droids and bounty hunters sent by the evil Vilgax, Ben, Gwen, and Grandpa Max begin their odd summer camping trip.
Dressed as Pilgrims, to honor their history, while in the streets of Salem, MA, Ben, Gwen, and Grandpa Max witness an explosion of a nearby building. But when Ben rushes to the rescue, Charmcaster is there waiting with a spell to take over Ben's body and the Omnitrix. Only things go awry and Gwen and Charmcaster switch bodies. Gwen goes to prison and the sorceress is brewing a plan to gain the Omnitrix. Now Gwen must find the way to get out of prison, alert her family against Charmcaster, and get her own body back using every trick up her sleeve... or Charmcaster's.Watch Now:AmazoniTunes
At a museum, Ben sits and reads a comic, daydreaming about himself as a super hero. As Gwen interrupts him, she is not happy how Ben treats the artwork. His day has been a bore, but when an alien vessel arrives, an alien named Volcanus and the bounty hunter Sixsix come to pursue the Biocenthium alloy to complete a mixture with Element X to create a bomb, strong enough to destroy a whole solar system. Suddenly, Ben meets The Galactic Enforcers, a group of three who serve in protecting the galaxy under the conduct code. Ben is intrigued by their heroic appearance, but are they really something to be looking up to?
Ben's alien heroes are starring in a silly network cartoon called Super Alien Hero Buddy Adventures and his favorite action hero Kangaroo Commando has been pulled off the air by the same network, so Ben tries to get him back on television and get credit for the alien heroes.Watch Now:AmazoniTunes