7 Stagione
184 Episodio
Le tenebrose avventure di Billy e Mandy - Season 7 Episode 14 La più perfida del reame
When Billy accidentally food-poisons Miss Butterbean, Principal Goodvibes offers Grim the job of substitute teacher, which Grim accepts as now Billy and Mandy have to obey him. Grim sends misbehaving students to the "Detention Dimension", a place of eternal classroom punishment, until only Mandy remains in his class. Grim tricks Mandy into opening a portal and she is dragged into the dimension too. Mandy proves to be more terrifying than Miss Slither, the giant, rattlesnake-like creature in charge of the Detention Dimension, that Mandy escapes the place and takes revenge on Grim by sending him there too.
- Anno: 2007
- Nazione: United States of America
- Genere: Animation, Comedy, Kids
- Studio: Cartoon Network
- Parola chiave: grim reaper, spin off
- Direttore: Maxwell Atoms
- Cast: Greg Eagles, Richard Steven Horvitz, Grey DeLisle, Vanessa Marshall