Will Arnett
Batman / Bruce Wayne (voice)

Michael Cera
Robin / Dick Grayson (voice)

Rosario Dawson
Batgirl / Barbara Gordon (voice)

Ralph Fiennes
Alfred Pennyworth (voice)

Zach Galifianakis
Joker (voice)

Jenny Slate
Harley Quinn (voice)

Jason Mantzoukas
Scarecrow (voice)

Conan O'Brien
The Riddler (voice)

Doug Benson
Bane (voice)

Billy Dee Williams
Two-Face (voice)

Zoë Kravitz
Catwoman (voice)

Kate Micucci
Clayface (voice)

Riki Lindhome
Poison Ivy (voice)

Eddie Izzard
Voldemort (voice)

Seth Green
King Kong (voice)

Jemaine Clement
Sauron (voice)

Ellie Kemper
Phyllis (voice)

Channing Tatum
Superman (voice)

Jonah Hill
Green Lantern (voice)

Adam Devine
The Flash (voice)

Héctor Elizondo
Jim Gordon (voice)

Mariah Carey
Mayor McCaskill (voice)

Lauren White
Chief O'Hara / Medusa / Additional Voices (voice)

David Burrows
Anchorman Phil (voice)

Laura Kightlinger
Reporter Pippa (voice)

Brent Musburger
Reporter #1 (voice)

Ralph Garman
Reporter #2 (voice)

Chris Hardwick
Reporter #3 (voice)

Chris McKay
Pilot Bill / Additional Voices (voice)

Susan Bennett
'Puter (voice)

Charlie Bean
Additional Voices (voice)