Watch Batman Unlimited: Monster Mayhem (2015) HD Full Movie Free on solarmovie.do. Watch Batman Unlimited: Monster Mayhem (2015) online free. The Joker is aided in his Halloween quest to render modern technology useless and take over Gotham C...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.