Sam Liu Director, Producer Christian Slater Deadshot Voice Tara Strong Harley Quinn Voice Vanessa Williams Amanda Waller Voice Billy Brown Bronze Tiger Voice Liam McIntyre Captain Boomerang Voice Kristin Bauer Killer Frost Voice Gideon Emery Copperhead Voice David Boat Two-Face Voice Trevor Devall Punch Voice Dave Fennoy Blockbuster , Tobias Whale Voice Greg Grunberg Maxum Steel Voice C. Thomas Howell Professor Zoom Voice Cissy Jones Knockout Voice Natalie Lander Darma Voice Matthew Mercer Savage Gunman Voice Julie Nathanson Silver Banshee Voice Jim Pirri Vandal Savage , Count Vertigo Voice Dania Ramirez Scandal Savage Voice James Urbaniak Professor Pyg Voice Alan Burnett Screenwriter Sam Register Executive Producer James Tucker Executive Producer Robert J. Kral Original Music Christopher D. Lozinski Film Editing