Season 1

2001-08-24

Billy and Mandy meet the Grim Reaper, who has come for the soul of Billy's pet hamster, and they challenge him to a contest/When Billy's mother discovers Grim, she has a nervous breakdown/Billy and Mandy trick Grim into doing their chores.

2001-09-07

Grim teaches Billy how to enter Mandy's mind and he takes over her body/Grim has a secret dream to be a swimsuit model/Grim decides to become a "good guy", but with disastrous results.

2001-12-14

Nergal, a lonely demon in need of friends, kidnaps the trio and force them into a "friendship" with him/Billy eats all the Person Scout cookies/Billy rubs a cursed lamp thinking a Genie will appear, but it turns out to be Grim's Mommy.

2002-07-26

In a case of mistaken identity, Grim is "mothered" by a lady who thinks he is her little boy, and he enjoys the attention/Billy's Mom returns home/Billy and Grim suspect Mandy of foul play when everyone in the neighborhood goes missing.

2003-10-04

"Something Stupid This Way Comes" Nergal returns, trying to win friends with a giant carnival. Billy takes up his cause, revealing to Nergal the five C's of friendship. "A Grim Surprise" Billy and Grim plan a surprise birthday party for Mandy, only to succumb to a surprise of their own. "Beasts & Barbarians" Billy and Irwin are addicted to the video game "Beasts & Barbarians." Mandy and Grim work to cure Billy and Irwin of their addiction by venturing to another dimension to give Billy and Irwin a taste of "the real thing."

2002-10-11

After eating a huge amount of junk food, Billy gets a stomachache/A bounty hunter who terminates "otherworldly" beings sets his sights on Grim/With Mandy gone for the day and night, Grim creates a Mandy "doll" for a lonely Billy.

2002-10-11

Billy persuades Grim to fight Sperg, the school bully/Eris a Goddess, whom Grim has a crush on, recruits Mandy to join her in pranking people/After swiping Grims's spell book, Billy summons an Underworld demon who possesses him.

2003-08-01

Grim joins Sperg's garage band "Purple Filth"/When everyone is too busy to play with him, a lonely Billy befriends a singing meteor with a taste for human brains/After eating cold stale pizza, the trio fall asleep and have bizarre dreams.

2003-06-13

Mandy's arch nemesis, Mindy, befriends Grim. But is Mindy all that she seems? Grim brings Billy and Irwin's monster cards to life! Grim gets Billy and Mandy into Toadblatt's Summer School of Scorcery!

2003-06-20

Brownie-loving zombies trap Billy, Mandy and Grim in their house! It's up to Hoss Delgado to lend a hand! Grim gets so sick he becomes alive!

2003-06-27

In a future place, Mandy rules the world. But not everyone is happy about it. Learn what happens when Billy and Mandy are forced to share the same bedroom! Eris returns! And this time, she enlists Billy's help to spread chaos throughout the world!

2003-07-04

When Irwin turns into a werewolf, Billy enters him in the dog show. Mandy visits the old haunted house down the street, which nobody has emerged from in years. Will Mandy make it out alive?

2003-07-11

Nergal attempts to woo Billy's aunt. Can Billy stop Nergal from sweeping his aunt off her feet? Mandy is horrified to discover she's developing a crush on a boy. She consults with Grim to help her get over it.