of extraterrestrial life (initially ten but later more).

On their first night camping in their grandfather's motorhome, nicknamed the Rust Bucket, Ben finds a mysterious alien watch-like device that sticks to his wrist, giving him the ability to transform into multiple shapes. The series centers on Ben Tennyson, a 10-year-old boy on a summer trip with his cousin Gwen and their grandfather Max, who is secretly a member of an intergalactic organization called the Plumbers.