|Real name||Benjamin "Ben" Tennyson|
|Nano Item||Sumo Slammers|
|Voiced by||Tara Strong|
Young Ben is Ben Tennyson as a ten-year-old.
Young Ben came to Prankster's Island to rest from fighting. When he heard about the teen Ben Tennyson, he thought someone was pretending to be him. The younger Ben set off to beat him up, but the plane he ordered crashed and now he is stranded on Prankster's Island.
Young Ben has 20 aliens:
- Grey Matter