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In the episode "The Power", Rigby sends several items to the moon, including "a bunch of baby ducks", and a soda machine that doesn't work using The Power. He also sends the Moon Monster there. The monster later proceeds to attack Skips, until Rigby uses "hamboning" to avert the crisis and save him. After Rigby escapes, the monster runs after the gang and unsuccessfully attempts to kill them.
The Moon Monster is very large and has Rigby's body, Mordecai's tail feathers, and Beef Burrito's head. He also wears a belt with a golden belt buckle, somewhat resembling the one on the Beef Burrito doll.
- He is the first antagonist of Regular Show, and the first to be undefeated.
- In the credits for "The Power", he was credited simply as "Monster".
- The Moon Monster appears in the Cartoon Network game "Escape From The Moon", which is featured in "Just a Regular Game."
- The Moon Monster represents Beef Burrito (a toy Rigby owns), Mordecai, and Rigby.
- In his concept art, he was originally going to have a beard, which is interesting as both beef burrito as shown on the television, and in doll form has a beard.
- He did not appear in Exit 9B.