Step siblings Gretchen and Clark arrive at Gretchen's grandparents' house in the middle of swamp country. After Clark plays a prank on her, Gretchen inadvertently enters a forbidden room, and is horrified by what she finds.
Courtney Hawkrigg
Gretchen
Ricky Mabe
Clark
Helen Hughes
Grandma Rose
Peter Boretski
Goosebumps Promo - How to Kill a Monster
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Grandpa Eddie
Tim Rykert
Swamp Monster