Dwayne Johnson Krypto the Superdog (voice) Kevin Hart Ace the Bat-Hound (voice) John Krasinski Clark Kent / Superman (voice) Keanu Reeves Bruce Wayne / Batman (voice) Kate McKinnon Lulu (voice) Vanessa Bayer PB (voice) Natasha Lyonne Merton (voice) Diego Luna Chip (voice) Jameela Jamil Diana Prince / Wonder Woman (voice) Marc Maron Lex Luthor (voice) Dascha Polanco Jessica Cruz / Green Lantern (voice) Olivia Wilde Lois Lane (voice) Jemaine Clement Arthur Curry / Aquaman (voice) Daveed Diggs Victor Stone / Cyborg (voice) John Early Barry Allen / The Flash (voice) Ben Schwartz Mark / Fire Guinea Pig (voice) Thomas Middleditch Keith / Ice Guinea Pig (voice) Maya Erskine Mercy Graves (voice) Yvette Nicole Brown Patty (voice) Alfred Molina Jor-El (voice) Lena Headey Lara (voice) Keith David Dog-El (voice) Busy Philipps Foofy Dog (voice) Dan Fogler Carl / Pilot / Racer (voice) David Pressman Corgi (voice) Jared Stern Bathtub Guy / JLA Hotline (voice) Michelle Morgan Mech Suit (voice)