Episode 1
Meet the Reaper
Billy's pet hamster, Mr. Snuggles, celebrates his 10th birthday, so the Grim Reaper comes for him. However, Ma...
Episode 2
Skeletons in the Water Closet
Billy's mother, Gladys, first notices Grim in Billy's bed, then in the shower and subsequently starts to get p...
Episode 3
Opposite Day
Billy and Mandy tell Grim it is "Opposite Day" and that, when they say something, they really mean the opposit...
Episode 4
Look Alive!
Grim is bored of being left alone while Billy and Mandy are not with him. Grim decides to fulfill his dream by...
Episode 5
Mortal Dilemma
Grim misses his life as the reaper of souls and, due to his bet, he cannot return to the Underworld, much to t...
Episode 6
Get Out of My Head!
After watching a movie, Grim teaches Billy to possess people by jumping into their heads. Billy possesses Mand...
Episode 7
Fiend Is Like Friend Without the 'R'
Billy wanders into a junkyard, where a massive hole in the earth opens up and pulls him down in. Later, Mandy...
Episode 8
Recipe for Disaster
Billy, Mandy, Grim and Pud'n are part of the "Person Scouts" (a Boy Scouts-esque organization) and need to sel...
Episode 9
A Dumb Wish
While Spring cleaning in the middle of November, Billy takes an old, cursed lamp from Grim's trunk. When he gi...
Episode 10
Grim vs. Mom
After having a nervous breakdown and leaving the house in the first episode, Billy's mother, Gladys, returns....
Episode 11
Tastes Like Chicken
With Irwin not answering the phone, Billy's parents missing and Mandy saying she wants "Billy for dinner", Bil...
Episode 12
Grim or Gregory?
It's Halloween, Billy, Mandy and Grim go trick-or-treating. Grim mistakes a woman for Atrocia, the host of the...
Episode 13
Something Stupid This Way Comes
Nergal, the fiend from the center of the Earth, returns to the surface, emerging a carnival with him, trying o...
Episode 14
A Grim Surprise
Billy tells Grim to help him throw a surprise birthday party for Mandy. Then, a reluctant Grim helps Billy pre...
Episode 15
Beasts and Barbarians
Billy and Irwin have been playing their favorite video game, Beasts and Barbarians, for three days non-stop. I...
Episode 16
Hoss Delgado: Spectral Exterminator
Billy, Mandy, and Grim go to the museum on a school trip. There, they meet Hoss Delgado, self-appointed hunter...
Episode 17
To Eris Human
While going to the shopping mall with Billy and Mandy, Grim spots the beautiful Eris, the goddess of discord a...
Episode 18
Billy's Growth Spurt
Billy eats too much junk food that makes him feel sick. Grim prepares him a remedy using his granny's recipe,...
Episode 19
Billy & the Bully
Billy is constantly provoked by a bully named Sperg and runs over to Grim for help.
Episode 20
Big Trouble in Billy's Basement
After taking the Underworld's "Bad Book" from Grim, Billy becomes possessed by an evil entity. Then, Billy ste...
Episode 21
Tickle Me Mandy
Mandy and her parents leave the city for a day, which makes Billy feel lonely. Then, Grim uses his supernatura...
Episode 22
Little Rock of Horrors
In this musical episode, which pays homage to Little Shop of Horrors, Billy befriends a singing brain-eating m...
Episode 23
Dream a Little Dream
Billy, Mandy, and Grim eat moldy pizza leftovers, and after falling asleep, they have nightmares. Billy dreams...