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Currently you are able to watch "Batman Unlimited: Monster Mayhem" streaming on HBO Go. It is also possible to buy "Batman Unlimited: Monster Mayhem" on Apple TV, Google Play Movies as download or rent it on Apple TV online.
The Joker is aided in his Halloween quest to render modern technology useless and take over Gotham City by Solomon Grundy, Silver Banshee, Clayface and Scarecrow.