Billy's Growth Spurt (S01E18)
S01E18
Billy indulges in too much junk food, which leaves him feeling ill. To help, Grim concocts a remedy based on his grandmother's recipe, but instead, it causes a parasite to develop on Billy's back, which he whimsically names Yap-yap. As they continue their junk food binge, Mandy suggests using the antidote to counteract the original remedy. Eventually, Yap-yap, now resembling a mini Billy, separates from him, trying to escape the antidote. Ultimately, Yap-yap consumes the antidote, leading to his demise and freeing Billy from the unwanted guest.
Show
The Grim Adventures of Billy and Mandy
Episode
S01E18
Air Date
Oct 04, 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