Self (1 episode)

Wendy Jenkins' Boss (1 episode)

Robert Walton (1 episode)

Dr. John Lehman (2 episodes)

Jeff

Judge Joseph Holt (3 episodes)

Russo

Chunky

Kurt (1 episode)

Professor Staggs (1 episode)

Office Manager

Bruce Hendricks (1 episode)

Self (1 episode)

Self (2 episodes)

Lloyd (1 episode)

Dr. Bernard Weiss (1 episode)

Self (1 episode)

Male Curlisha

Buddy (1 episode)

Timothy Gipson (1 episode)

Dr. Drew (1 episode)

Judge Brent Gordon (1 episode)

Dr. Stewart (1 episode)

Kevin Scott (1 episode)

Cambis Borrin (1 episode)

Mr. Swindell (1 episode)

Bill Weston (1 episode)

Alvin Kapitski (1 episode)

Harry

Doctor Ben (1 episode)

Mitchell Blair (1 episode)

Father Reilly

Watson (1 episode)

Abbie's ObGyn

Gordon (1 episode)

Dr. Klein

West Waters (1 episode)

Lloyd Zane Miller

Harvey Larson (1 episode)

Dean Randolph (1 episode)

Edwin Shaw (1 episode)

Dr.Mize (1 episode)

Eugene Goodman (1 episode)

Dr. Edward Harkness (1 episode)

Doug Ouellet (1 episode)

Dr. Lloyd Madden (4 episodes)

Mr. DeLarge (2 episodes)

Dr. William Crispin (13 episodes)

Sam

Heidecker (2 episodes)

Malcolm Eddery

Dr. Henklefust (voice) (1 episode)

Roger Halsted (1 episode)

Bum

Norman Miller (1 episode)

Doug

Stan Jacobson (2 episodes)

Father Alfred McKavee

Ellis Mars (1 episode)

Coswell (1 episode)

Alan (1 episode)

Professor West

Prof. James Kellogg

Hugh Rollins (1 episode)

Michael Latham (3 episodes)

Harry (1 episode)

Jonah Henry

Mike Spencer (17 episodes)

Phil (1 episode)

(1 episode)

Brady

Daniel Foote (1 episode)

Jacob Nolston (2 episodes)

Paul Cydon (1 episode)

(1 episode)

Brad

Harry

(1 episode)

Mike (1 episode)

Langdon

Egan Foote (13 episodes)

Tom Newman (1 episode)

Harrison McKendrick

Terrence Steadman (2 episodes)

Cecil Arthur (1 episode)

Ben White (1 episode)

Dogcatcher Doyle

George Marks (2005) (2 episodes)

Mr. Rothman

Dr. Royce (1 episode)

Chae

Mr. Jensen

Paramedic

Simon Coombs (1 episode)

Lie Detector Coach

(1 episode)

Phlox (97 episodes)

Driving Instructor

Andrew Gindes

Boring Man (1 episode)

(1 episode)

Hammond

Barry

Dr. John Fallow (1 episode)

Peter Garfield (1 episode)

(1 episode)

Mr. Remmy (1 episode)

Edward Duke (1 episode)

Bebe's Attorney (1 episode)

Eddie Dagabosian (1 episode)

Prof. Miles Ballard (13 episodes)

John Waddington

(1 episode)

Irate Driver

Dr. Andrew Pike

Timothy 'Timmy the Geek' Landau (1 episode)

FBI Agent #1

Clifford (2 episodes)

Kenny (1 episode)

Kenny (archive footage) (1 episode)

Delivery Guy (1 episode)

Mr. Snow (1 episode)

Lee

(1 episode)

Revenue Officer Robert Schmidt (1 episode)

Simms (segment "The Wall") (1 episode)

Technician

Officer Jenkins

Patient (1 episode)

Linus