Watch Batman Unlimited: Monster Mayhem online free with HQ / high quailty. Stream movie Batman Unlimited: Monster Mayhem.It’s Halloween night in Gotham City and Scarecrow, Clayface, Silver Banshee and Solomon Grundy have hit the streets to stir up trouble! Batman is on the trail of the city’s spookiest villains while, further complicating matters, the clown prince of crime himself, The Joker, is ruling over this mysterious crew of misfit criminals. It’s up to the Dark Knight to stop this gruesome gang before they unleash “digital laughter,” a computer virus that’s part of a diabolical plan to jeopardize all of Gotham City’s vital technology. Batman, Green Arrow, Cyborg, Nightwing and Red Robin must combine forces to battle these baddies and save the city.