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Watch Billy & Mandy's Big Boogey Adventure online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

When the Boogey Man causes Grim to lose his powers, rank, and title in the Underworld Court for misusing his powers, he plots to seek out Horror’s Hand and take over the world. It’s up to Billy, Mandy, Irwin, and Grim to get to Horror’s Hand before the Boogey Man does.