When Melvin tries to cancel Halloween, clever best friends Harold and George create their own spooky holiday — and it’s a huge success.

Also Known As: The Spooky Tale of Captain Underpants Hack-a-Ween, Das gruselige Abenteuer des Captain Underpants: Hack-O-Ween, Capitaine Superslip et le conte terrifiant du Trompe-loween, Histórias Assustadoras do Capitão Cueca Hackeando o Halloween, Los espantosos cuentos del Capitán Calzoncillos: Hack-loween, Η Τρομακτική Ιστορία του Καπετάν Βράκα και του Άλλογουιν

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