The Grim Adventures of Billy and Mandy Season 1 Episode 20 Big Trouble in Billy's Basement 2001
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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.
- Released: 2002-10-11
- Runtime: 11 minutes
- Genre: Animation, Comedy, Kids
- Stars: Greg Eagles, Richard Steven Horvitz, Grey DeLisle, Vanessa Marshall
- Director: Brian A. Miller, Jay Bastian, Drew Neumann, Gregory Hinde
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1. Meet the Reaper 2001-08-24
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2. Skeletons in the Water Closet 2001-08-24
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3. Opposite Day 2001-08-31
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4. Look Alive! 2001-08-31
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5. Mortal Dilemma 2001-09-07
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6. Get Out of My Head! 2001-09-07
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7. Fiend Is Like Friend Without the 'R' 2001-10-05
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8. Recipe for Disaster 2001-10-12
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9. A Dumb Wish 2001-10-19
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10. Grim vs. Mom 2002-07-19
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11. Tastes Like Chicken 2002-07-19
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12. Grim or Gregory? 2002-07-26
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13. Something Stupid This Way Comes 2002-07-26
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14. A Grim Surprise 2002-08-02
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15. Beasts and Barbarians 2002-08-02
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16. Hoss Delgado: Spectral Exterminator 2002-08-09
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17. To Eris Human 2002-08-09
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18. Billy's Growth Spurt 2002-10-04
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19. Billy & the Bully 2002-10-04
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20. Big Trouble in Billy's Basement 2002-10-11
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21. Tickle Me Mandy 2002-10-11
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22. Little Rock of Horrors 2002-10-18
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23. Dream a Little Dream 2002-10-18
