Nathan Fillion as Hal Jordan / Green Lantern (voice)

Jason Isaacs as Sinestro (voice)

Elisabeth Moss as Arisia Rrab (voice)

Henry Rollins as Kilowog (voice)

Arnold Vosloo as Abin Sur (voice)

Tony Amendola as Kentor / Appa Ali Apsa (voice)

Steve Blum as Kloba Vud (voice)

Grey DeLisle as Ree'Yu / Ardakian Trawl / Boodikka (voice)

Kelly Hu as Laira (voice)

Michael Jackson as Ganthet (voice)

Peter Jessop as Salaak (voice)

David Kaufman as Rubyn (voice)

Sunil Malhotra as Bolphunga's Ship (voice)

Roddy Piper as Bolphunga (voice)

Andrea Romano as Abin Sur's Ring / Deegan's Ring (voice)

Jane Singer as Wachet (voice)

James Arnold Taylor as Tomar-Re / Ysmault Prisoner (voice)

Bruce Thomas as Atrocitus (voice)

Mitchell Whitfield as Avra (voice)

Wade Williams as Deegan (voice)

Gwendoline Yeo as Blu (voice)

Bruce Timm as Galius Zed (voice) (uncredited)