The Grim Adventures of Billy and Mandy
Season 1, Episode 12: Grim or Gregory?
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It's Halloween, Billy, Mandy and Grim go trick-or-treating. Grim mistakes a woman for Atrocia, the host of the all-night Halloween marathon on TV and goes to talk to her. Upon looking at her face, Grim realizes his mistake; however, the woman mistakes Grim for her son, Gregory, and takes him home Gregory is now Grim, and does not have a stomach. At the same time, Billy mistakes Gregory for Grim and he and Mandy take him with them. In the end, Billy and Mandy take Gregory back to his mother and Grim goes back with them.
All Episodes - Season 1
Episode 1
Meet the Reaper
Episode 2
Skeletons in the Water Closet
Episode 3
Opposite Day
Episode 4
Look Alive!
Episode 5
Mortal Dilemma
Episode 6
Get Out of My Head!
Episode 7
Fiend Is Like Friend Without the 'R'
Episode 8
Recipe for Disaster
Episode 9
A Dumb Wish
Episode 10
Grim vs. Mom
Episode 11
Tastes Like Chicken
Episode 12
Grim or Gregory?
Episode 13
Something Stupid This Way Comes
Episode 14
A Grim Surprise
Episode 15
Beasts and Barbarians
Episode 16
Hoss Delgado: Spectral Exterminator
Episode 17
To Eris Human
Episode 18
Billy's Growth Spurt
Episode 19
Billy & the Bully
Episode 20
Big Trouble in Billy's Basement
Episode 21
Tickle Me Mandy
Episode 22
Little Rock of Horrors
Episode 23
Dream a Little Dream