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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.
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 phút
Studio: Cartoon Network
Quốc gia: United States of America
