Ten-year-old Ben Tennyson is given the power to change into 10 different alien heroes. With help from Grandpa Max and cousin Gwen, Ben fights to save the world from evil.
Ten year old Ben Tennyson, his Grandpa Max and his Cousin Gwen's summer of adventure takes an odd turn when Ben discovers a watch-like object.
Ben and his alien hero personas must battle Dr. Animo a crazed mad scientist bent on revenge and armed with the DNA altering transmorpher device.
While stopped at a lakefront campsite Ben has a chance encounter with a Loch Ness-type sea monster called a Krakken.
Grandpa Gwen and Ben visit an elderly relative only to find that her retirement community has been overrun by a group of shape-shifting aliens!
Ben faces his toughest challenge when Vilgax sends three alien bounty hunters to retrieve the Omnitrix.
Ben's prank backfires when he releases a Megawhatt a destructive monster made of electrical energy.
After an argument with Max Ben leaves for the city on his own and encounters a boy who has the power to absorb energy - and the power of the Omnitrix.
Ben discovers that a tough gang leader has merged with parts of Vilgax's robot drones to become an alien cyborg.
Ben must overcome his deathly fear of clowns when Gwen is kidnapped by the ringmaster at an evil circus.
Ben battles an evil sorcerer whose power emanates from mystic charms, one of which turns Gwen into her own superhero named Lucky Girl.
At a water park Ben decides to go alien to get on a ride.
Vilgax decides to come after the Omnitrix prototype himself.