The Spooky Tale of Captain Underpants: Hack-a-ween

When Melvin tries to cancel Halloween, clever best friends Harold and George create their own spooky holiday -- and it's a huge success! When Melvin tries to cancel Halloween, clever best friends Harold and George create their own spooky holiday -- and it's a huge success! When Melvin tries to cancel Halloween, clever best friends Harold and George create their own spooky holiday -- and it's a huge success! When Melvin tries to cancel Halloween, clever best friends Harold and George create their own spooky holiday -- and it's a huge success!