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.
Ben thinks he’s having “the perfect day” only to realise he’s been put in a dream world by Enoch and the Forever Knights who are after the Omnitrix.
While at the beach Ben discovers a new hero Ditto and soon has the ability to create multiple Dittos at once. These multiple Dittos can’t agree on anything and drive Gwen crazy.
Ben and Grandpa Max turn into kids when they come in contact with water from the fountain of youth. Gwen must stop Hex from finding the fountain's location.
Gwen Ben and Max attend a wedding where an Alien is marrying a human that is interuppted by a strange alien who turns out to be the bride's ex-boyfriend!
When Ben and the gang journey through the desert the RV is stolen by a group of pirates who decide to use it to go on a robbery.
Ben uses Fourarms to compete in an ultimate wrestling contest so that he can replace Gwen's broken computer with the prize money.
In the far future for Ken's 10th Birthday Ben gives his son an Omnitrix for his birthday present. However can Ben learn to trust Ken with all that power?
Ben, Max and Gwen put up an Alamo-like stand inside the bunker at Mount Rushmore and against great odds defeat the Forever King's band of baddies.
Ben, Max Ben and Gwen investigate a couple of daring break-ins, only to discover they were once both secret Plumber installations.
Ben goes back to school and he finds that life is quite boring. However the arrival of Vilgax promises to change all that.