Season
Season 7 Episode
- Season 4 The Secret Snake Club
- Season 4 He's Not Dead, He's My Mascot
- Season 4 Hog Wild
- Season 4 The Bad News Ghouls
- Season 4 The House of No Tomorrow
- Season 4 Happy Huggy Stuffy Bears
- Season 4 The Secret Decoder Ring
- Season 4 Wild Parts
- Season 4 The Problem with Billy
- Season 4 Wishbones
- Season 4 Dream Mutt
- Season 4 Scythe for Sale
- Season 4 Jeffy's Web
- Season 4 Irwin Gets a Clue
- Season 4 Duck!
- Season 4 Aren't You Chupacabra to See Me?
- Season 4 Zip Your Fly
- Season 4 Puddle Jumping
- Season 4 Runaway Pants
- Season 4 Scythe 2.0
- Season 4 The Firebird Sweet
- Season 4 The Bubble with Billy
- Season 4 Billy Idiot
- Season 4 Home of the Ancients
The Grim Adventures of Billy and Mandy - Season 4 Episode 7 The Secret Decoder Ring
8.10 11 minutes When Billy finally gets a "secret decoder ring" in his Blasto Bits cereal, he receives a holographic message from a strange creature who speaks about finding the "Secret of the Universe" in an abandoned mine shaft. All the other children of Endsville, also with decoder rings, race to the mine to be the first one to get the Secret. The entire effort is revealed to be a trap laid by Lubbermouth, a worm-like creature from Grim's past, who wishes to free herself from the curse of guarding the Secret. When Mindy looks down at the pit, she becomes the new guardian of the Secret and has to stay there forever.
