|Introduced in||Animated short|
|Latest appearance||Catbug's Away Team|
Hi-Five Aliens are a species first seen in the animated short. In the episode, the Bravest Warriors save them from a planet in a collision course with theirs. They also learned the custom of high-fiving from the Warriors.
The Hi-Five Aliens are all identical looking, being short and green with a single arm extending from the top of their heads. They also have a pink, skirt-like extension going around their waist.
- The Hi-Five Aliens have a similar appearance to Regular Show's Hi-Five Ghost.
- Wallow is currently keeping one as a pet, as seen in "Catbug."
- The voice actress who voices Tree Trunks from Adventure Time, Polly Lou Livingston, voices one of the Hi-Five Aliens.