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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.
Ngày phát sóng đầu tiên : Aug 24, 2001
Ngày phát sóng cuối cùng : Nov 09, 2007
Tập phim : 184 Tập phim
Mùa : 7 Mùa
Thời gian chạy: 11:7 phút
Studio: Cartoon Network
Quốc gia: United States of America
