Walter Hoade

The Gentleman (Voice) (1 episode)

Bud Nielsen (1 episode)

Guy Gardner (1 episode)

Self (1 episode)

Guy Gardner

Zan (voice) (2 episodes)

Self (1 episode)

Brett Wright

Headpool (voice)

Johnny (voice) (8 episodes)

Ace Spade (1 episode)

Master Karja

CIA Director Alton West (5 episodes)

John Nolan (3 episodes)

Executive Producer (22 episodes)

Duke

Self (1 episode)

T.D.K.

Simon Williams / Wonder Man (voice) (2 episodes)

Octopus (voice) (2 episodes)

42 (voice) (4 episodes)

Self - Guest (2 episodes)

Jolene Glaplok (1 episode)

Self

Self - Cameo (uncredited) (1 episode)

Self (1 episode)

Quinn

Green Lantern / Hal Jordan (voice)

Captain Superior (voice)

John Nolan (129 episodes)

Executive Producer (129 episodes)

Hal Jordan / Green Lantern (voice)

Nathan Fillion (2 episodes)

Jacques Snicket (voice) (1 episode)

Jacques Snicket (9 episodes)

Nathan Fillion (voice) (9 episodes)

(6 episodes)

Shojun (voice)

Sterling (voice)

Mark Devereaux (1 episode)

Cornvelious Daniel (voice) (1 episode)

Gary West (6 episodes)

Rainer Shine (7 episodes)

Self (1 episode)

Tetter Spice (1 episode)

Self (1 episode)

Self (1 episode)

Wernher von Braun (1 episode)

Green Lantern (voice)

Jack Moore (25 episodes)

Executive Producer (25 episodes)

Cactoid Jim

Nathan Fillion (1 episode)

Green Lantern / Hal Jordan (voice)

Chick del Monte / Assassin Banana (voice) (3 episodes)

Preston Northwest (voice) (4 episodes)

Monstrous Inmate

Self (1 episode)

Green Lantern / Black Adam (voice)

Johnny (voice)

Bob Waite (2 episodes)

Hermes

Hal Jordan / Green Lantern (voice)

Johnny (voice)

Dogberry

Green Lantern / Mr. Freeze (voice)

Self (1 episode)

American Businessman Klaus (voice) (1 episode)

Liver / Joel Larson (voice) (1 episode)

Green Lantern (voice)

Self (1 episode)

Nathan Fillion (2 episodes)

Hal Jordan / Green Lantern (voice)

The Holy Avenger

Brown Widow (voice) (4 episodes)

Richard Castle (173 episodes)

Producer (22 episodes)

Col. Steve Trevor (voice)

Chris (1 episode)

Captain Hammer (3 episodes)

Runner

Self (1 episode)

Adam Mayfair (11 episodes)

(2 episodes)

Dr. Jim Pomatter

Alex Tully (6 episodes)

Abe Dale

Kevin Callis (1 episode)

Bill Pardy

Malcolm 'Mal' Reynolds

Vigilante (voice) (2 episodes)

Luke Riley

Adam Logan (6 episodes)

Robert Graves

Caleb (5 episodes)

Mal Reynolds (11 episodes)

Frisbee Guy (voice) (1 episode)

Father David

Michael Ryan (1 episode)

Cliff

Johnny Donnelly (60 episodes)

Ronald (18 episodes)

Minnesota Ryan

Troy Larson (13 episodes)

Master Warrant Officer Tom Jardine