Big Trouble in Billy's Basement (S01E20)
S01E20
After snatching the Underworld's "Bad Book" from Grim, Billy is overtaken by a malevolent spirit. In his chaos, he pilfers Grim's scythe and uses it to create a portal to summon Yog-Sothoth. Seeing the turmoil, Mandy calls upon Hoss Delgado to confront Billy. They discover that the only way to close the portal is by tossing the book inside. As Billy devours the book, Mandy pushes him into the portal, restoring order. Moments later, another portal opens, and Billy emerges, grumbling that they didn’t want him there.
Show
The Grim Adventures of Billy and Mandy
Episode
S01E20
Air Date
Oct 11, 2002
Season 1 Episodes
S01E01
Meet the Reaper
S01E02
Skeletons in the Water Closet
S01E03
Opposite Day
S01E04
Look Alive!
S01E05
Mortal Dilemma
S01E06
Get Out of My Head!
S01E07
Fiend Is Like Friend Without the 'R'
S01E08
Recipe for Disaster
S01E09
A Dumb Wish
S01E10
Grim vs. Mom
S01E11
Tastes Like Chicken
S01E12
Grim or Gregory?
S01E13
Something Stupid This Way Comes
S01E14
A Grim Surprise
S01E15
Beasts and Barbarians
S01E16
Hoss Delgado: Spectral Exterminator
S01E17
To Eris Human
S01E18
Billy's Growth Spurt
S01E19
Billy & the Bully
S01E20
Big Trouble in Billy's Basement
S01E21
Tickle Me Mandy