The Grim Adventures of Billy & Mandy - Season 4 (2005)

In "Happy Huggy Stuffy Bears", Billy, Mandy and Grim all meet a suspicious woman named Serisue, who gives Mandy a paying job as spokesperson for the Happy Huggy Stuffy Bears, and soon, abnormal things happen. In "The Secret Decoder Ring", Billy finds a decoder ring in his cereal box which he tries to use to find the secret of the universe. However, he is not the only one trying to do it like this.

In "Wild Parts", a nose-less wizard searches for a new nose so he can smell again... and he selects Billy's bulbous proboscis for it. In "The Problem With Billy", annoyed at Billy's idiocy, Grim consults Billy's father on the subject, but he contradicts this by recounting Billy's life, in which Billy is claimed to actually be a genius!

Billy, Mandy and Grim stumble upon a skull that contains nine wishes, all of which must be granted before it can be freed.

In "Dream Mutt", Billy's wish for a new dog comes true, thanks to Grim, but can this friendship between a boy and his dog last? In "Scythe For Sale", Billy inadvertently sells Grim's scythe to Irwin.

In "Jeffy's Web", Jeff the spider lays a thousand eggs and asks Billy to take care of them. In "Irwin Gets a Clue", Irwin becomes Hoss Delgado's sidekick.

In "Duck!", the spirit of a duck follows everyone in Endsville around making Bronx cheer noises. In "Aren't You Chupacabra To See Me?", Billy befriends a Chupacabra that lives in an enchanted VHS tape and can emerge into reality via the TV.

In "Zip Your Fly", a "wardrobe malfunction" on the part of a magic zipper causes Mandy and a fly to switch heads with one another. In "Puddle Jumping", Billy, Mandy and Grim have fun with an enchanted kiddie pool that has the power to transport them to other bodies of water in alternate dimensions.

In "Runaway Pants", Nergal, Jr. turns into a pair of pants. In "Scythe 2.0", Grim tries to upgrade to a new scythe, with disastrous results.

In "The Firebird Sweet", Billy discovers a magical phoenix inside a box of Frosted Golden Apple Scraps. In "The Bubble With Billy", Billy receives from Grim some underworld gum, which must not be swallowed.

In "Billy Idiot", Billy pursues his dream of being a ballet dancer. In "Home of the Ancients", Grim, Billy and Mandy are sentenced to community service in a retirement home.