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.
Not streaming on a subscription service in the US right now.
Starring Roger Craig Smith, Troy Baker, Chris Diamantopoulos, Kari Wührer, Noel Fisher, Khary Payton, Will Friedle, Yuri Lowenthal, Fred Tatasciore, Brian T. Delaney