Christian Slater Floyd Lawton / Deadshot (voice) Tara Strong Harleen Quinzel / Harley Quinn (voice) Billy Brown Ben Turner / Bronze Tiger (voice) Liam McIntyre George Harness / Captain Boomerang (voice) Vanessa Williams Amanda Waller (voice) Kristin Bauer Crystal Frost / Killer Frost (voice) Gideon Emery Sameer Park / Copperhead (voice) C. Thomas Howell Eobard Thawne / Professor Zoom (voice) Greg Grunberg Steel Maxum (voice) Julie Nathanson Siobhan Smythe / Silver Banshee (voice) / Jewelee (voice) Dave Fennoy Blockbuster (voice) / Tobias Whale (voice) / Black Manta (voice) Dania Ramirez Scandal Savage (voice) Cissy Jones Knockout (voice) / Female Announcer (voice) James Urbaniak Lazlo Valentin / Professor Pyg (voice) Jim Pirri Vandal Savage (voice) / Werner Zytle / Count Vertigo (voice) Natalie Lander Darma (voice) Trevor Devall Punch (voice) / Thug #1 (voice) Matthew Mercer Savage Gunman / Argus Scientist / Belle Reve Doctor (voice)