Seth Green

The Nerd / Batman / Robin / Scarecrow / Darkseid / Ace the Bathound / Toyman / Dr. Fate / Jimmy Olsen / Black Manta / Aquaman / Clayface / The Penguin / Killer Croc / Cyborg / Banehound / Various (voice)

Breckin Meyer

Superman / Bizarro (voice)

Nathan Fillion

Green Lantern / Black Adam (voice)

Alex Borstein

Wonder Woman (voice)

Matthew Senreich

The Flash / Reverse-Flash / Weather Wizard / Waiter (voice)

Alfred Molina

Lex Luthor / Green Arrow (voice)

Zac Efron

Superboy / Brainiac (voice)

Sarah Hyland

Lena Luthor (voice)

Clancy Brown

Gorilla Grodd (voice)

Paul Reubens

The Riddler / Sunbather (voice)

Giovanni Ribisi

The Joker / Two-Face (voice)

Kevin Shinick

Narrator / Starro / Captain Cold (voice)