David Boreanaz as Hal Jordan / Green Lantern (voice)

Miguel Ferrer as J'onn J'onzz / Martian Manhunter (voice)

Neil Patrick Harris as Barry Allen / The Flash (voice)

John Heard as Ace Morgan (voice)

Lucy Lawless as Wonder Woman (voice)

Kyle MacLachlan as Superman (voice)

Lex Lang as Rick Flagg (voice)

Phil Morris as King Faraday (voice)

Kyra Sedgwick as Lois Lane (voice)

Brooke Shields as Carol Ferris (voice)

Jeremy Sisto as Batman (voice)

Joe Alaskey as Bugs Bunny (voice)

Jeff Bennett as Sportscaster (voice)

Corey Burton as Abin Sur (voice)

Townsend Coleman as Dr. Magnus (voice)

Keith David as The Centre (voice)

Sean Donnellan as Haley (voice)

Robin Atkin Downes as The Guardian (voice)

Shane Haboucha as Robin (voice)

David Hunt as Harry (voice)

Vicki Lewis as Iris West (voice)

Joe Mantegna as Crooner (voice)

Vanessa Marshall as Amazon Woman (voice)

Jim Meskimen as Slam Bradley (voice)

James Arnold Taylor as Captain Cold (voice)