The Grim Adventures of Billy and Mandy - Season 1 Episode 20
After taking the Underworld's "Bad Book" from Grim, Billy becomes possessed by an evil entity. Then, Billy steals Grim's scythe, and uses it to open a portal to summon Yog-Sothoth. In consequence, Mandy calls for Hoss Delgado to battle Billy. It is revealed that the portal can only be sealed by throwing the book into it. As Billy eats the book, Mandy throws Billy himself into the portal, restoring everything to normal. Instants later, a portal opens up and Billy comes out and says they didn't want him there.
First Air Date : 2001-08-24
Last Air date : 2007-11-09
Runtime : 57 minutes
Genre : Animation, Comedy, Kids
Cast : Greg Eagles, Richard Steven Horvitz, Grey DeLisle, Vanessa Marshall
Crew : Brian A. Miller (Executive Producer), Gregory Hinde (Music), Drew Neumann (Music), Jay Bastian (Executive Producer)
Quality : 
Subtitles :
- Season 1 : Episode 12001-08-24
- Season 1 : Episode 22001-08-24
- Season 1 : Episode 32001-08-31
- Season 1 : Episode 42001-08-31
- Season 1 : Episode 52001-09-07
- Season 1 : Episode 62001-09-07
- Season 1 : Episode 72001-10-05
- Season 1 : Episode 82001-10-12
- Season 1 : Episode 92001-10-19
- Season 1 : Episode 102002-07-19
- Season 1 : Episode 112002-07-19
- Season 1 : Episode 122002-07-26
- Season 1 : Episode 132002-07-26
- Season 1 : Episode 142002-08-02
- Season 1 : Episode 152002-08-02
- Season 1 : Episode 162002-08-09
- Season 1 : Episode 172002-08-09
- Season 1 : Episode 182002-10-04
- Season 1 : Episode 192002-10-04
- Season 1 : Episode 202002-10-11
- Season 1 : Episode 212002-10-11
- Season 1 : Episode 222002-10-18
- Season 1 : Episode 232002-10-18
