The Grim Adventures of Billy & Mandy - Season 2 (2003)

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?

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.

T help Billy pass a test, Grim gives Billy a bookworm to eat in order to smarten up. Unfortunately, the cat gets to the bookworm first.

Grim is mistaken for "Sister Big Mama" and gets adopted by a convent of loving, bell-ringing nuns. It's up to Billy and Mandy to set them straight.

Billy tries to show off at the Rennaissance Festival in a suit of cursed knight's armor conjured by Grim!

Billy and Grim trade places for a day to see what it's like in the other one's shoes.

"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."

Jack, a headless prankster from Grim's past, uses Billy to steal Grim's scythe so he can destroy Grim and take over the world with demons from the Netherworld.