Kaley Cuoco Harley Quinn (voice)

Lake Bell Poison Ivy (voice)

Jason Alexander Sy Borgman (voice)

Diedrich Bader Batman (voice)

Giancarlo Esposito Lex Luthor (voice)

Sean Giambrone Joshua (voice)

Wayne Knight The Penguin (voice)

Ron Funches King Shark (voice)

Howie Mandel Howie Mandel (voice)

George López George Lopez (voice)

Billy Bob Thornton Billy Bob Thornton (voice)

James Gunn James Gunn (voice)

Cathy Ang Golden Glider (voice)

Alfred Molina Mr. Freeze (voice)

Sanaa Lathan Catwoman (voice)

Larry Owens Music Meister (voice)

Sam Richardson Swamp Thing (voice)

Matt Ryan Constantine (voice)

Krizia Bajos Bethany (voice)

James Corleto Benicio (voice)

Amy Sedaris Debbie (voice)

Larissa Gallager Prawn (voice)

Griffin Newman Mad Hatter (voice)

Jack Stanton Little Bruce (voice)

Briana Cuoco Batgirl (voice)

Rory Scovel Gus (voice)

Matt Oberg Kiteman (voice)

Tisha Campbell Tawny Young (voice)

Michael Ironside Darkseid (voice)

Jessica Walter Wendy / Granny Goodness (voice)

Jim Rash The Riddler (voice)

Jameela Jamil Eris (voice)

Tony Hale Dr. Psycho (voice)

Justina Machado Bethany (voice)

Scott Porter The Flash (voice)

Andy Daly Two-Face (voice)

Jonah Platt Singing Clayface (voice)

Will Sasso Maxie Zeus / Jennifer's Husband (voice)

James Wolk Superman (voice)

Alan Tudyk Clayface / The Joker (voice)

James Adomian Bane/Vincent Edge/Animal Control Officer (voice)

Rachel Dratch Nora Freeze (voice)

Meryl Hathaway Marcus (voice)

Rahul Kohli Scarecrow (voice)

Nicole Sullivan Mrs. Cobblepot / Benjamin (voice)

Jacob Tremblay Robin (voice)

Wanda Sykes Queen of Fables (voice)

Natalie Morales Lois Lane (voice)

Frankie Muniz Frankie Muniz (voice)

Suzy Nakamura Realtor (voice)

Christopher Meloni Commissioner Gordon (voice)

Rhea Perlman Golda (voice)

Tom Kenny The Arm (voice)

Mark Whitten The Cowled Critic / Herman (voice)

Brad Morris Businessman / Prisoner (voice)

Tom Hollander Alfred (voice)

Vanessa Marshall Wonder Woman (voice)

Mary Holland Jennifer / Tabitha (voice)

Phil LaMarr Koko (voice)

Chris Diamantopoulos Aquaman / Chef (voice)

Harvey Guillén Nightwing (voice)

Gary Anthony Williams King Baby (voice)

Kari Wahlgren Plastique / Queen Elizabeth II (voice)

Leila Birch Enchantress / Lover #1 (voice)

Quinta Brunson Hawkgirl (voice)

Brett Goldstein Brett Goldstein (voice)

Josh Helman Captain Boomerang (voice)

John Stamos Etrigan the Demon (voice)

Janet Varney Mera (voice)

Tyler James Williams Hawkman (voice)

JB Smoove Frank the Plant (voice)

Casey Wilson Betty (voice)

Talia Tabin Reporter 1 (voice)

Keith Ferguson Male Pedestrian (voice)

Ben Levin Captain Cold (voice)

Sammi Corona-Lampa Sofia (voice)

Leilani Barrett Pool Boy #2 (voice)

Eric Bauza Starro / Bouncing Boy (voice)

Amy K. Harmon Ramona / Drunk Woman (voice)

Justin Willman Magician / Buffet Man / Deejay (voice)

Jeannie Tirado Volcana (voice)

Larissa Gallagher Time Sphere (voice)

Charlie Adler Nick / Goon 1 (voice)

Susie Essman Sharon (voice)

Aline Elasmar Talia Al Ghul / Livewire (voice)

Paul W. Downs The Jons (voice)

Lacey Chabert Supergirl (voice)

Edi Patterson Veronica Cale (voice)

Zeno Robinson The Flash (voice)

Rain Valdez Alysia (voice)

Kerry Knuppe Terra (voice)

Vico Ortiz Tefe (voice)

Amari McCoy Mitzi (voice)

Zosia Mamet Princess Ladyfingers (voice)

Janeane Garofalo Signora/Mama (voice)

Eric Morgan Stuart Scientist (voice)

Gregg Turkington Clegg (voice)

John Slattery Jason Woodrue (voice)

Stephen Fry Brainiac (voice)

Kimberly Brooks Shaun Shark (voice)