Roscoe

Drama Teacher

Dr. Robert Montee (2 episodes)

Proprietor Isaac

Kirby

Mike Holland (1 episode)

Confused Fan (voice)

Palm Royale Manager (5 episodes)

Eustance the Boss

Herb

(voice) (2 episodes)

Lionel

Roy

Dr. Venture / Phantom Limb / Jonas Venture Jr. (voice)

Kurt Gödel

Rocky (voice)

Victor Simmons

Gordon

Roman Soldier (1 episode)

Heinrich Himmler

Grand View High School Principal

Irv Merlin

Interviewer (2 episodes)

Norm Wakely (1 episode)

Backstage Manager (1 episode)

Bram

Imp (1 episode)

Ophthalmologist (1 episode)

The Trinket Man (1 episode)

Professor Anthony

Commercial Bot (voice) (1 episode)

Self (1 episode)

Pierce Hamilton (10 episodes)

Gavin Donahue (3 episodes)

Dr. Toodles (voice) (1 episode)

(2 episodes)

Agent Marcus Strang

Stevie (1 episode)

Howard Pine (1 episode)

Tom (1 episode)

Dr. Leo Demopoulos (1 episode)

Owen Quinn (2 episodes)

Lazlo Valentin / Professor Pyg (voice)

Carl Fromm (1 episode)

Dr. Kincaid, Rose's Father

Gus Lobrano

Harry

Joff (voice) (1 episode)

M-OC (voice) (8 episodes)

M-OC / Imperial Ensign (voice) (1 episode)

M-OC / Sgt. Corcillo (voice) (1 episode)

Maaldorian Doctor (1 episode)

The Agent

Nick Lingeman (1 episode)

James Miller (1 episode)

Arthur Tack (28 episodes)

Nose Picker Fish (voice) (1 episode)

Fisher

Thriffith (voice) (2 episodes)

Simon Grim

Doll Zero

Miles Van Ert (2 episodes)

Lemur #1 (voice) (1 episode)

Rev. Boxley Fryer (1 episode)

Rev. Boxley Fryer

Sir Broderick / Male Workman 1 / Male Workman 2 (voice)

Rat King / Leaf Beard (1 episode)

Vice President Blowfish (1 episode)

Dr. Cooper Whitehead, Ph.D.

Grant Grunderschmidt (22 episodes)

Glen

Gary Nathan (1 episode)

Aaron Kalinoski (1 episode)

Future Doctor (1 episode)

Sweetie

Bill Gates

Mike Sylva (1 episode)

Mr. Blakeney (1 episode)

Henrik Habersteam (3 episodes)

The Dark One

Judge Bernard Temple (1 episode)

Voice Actor (voice)

Daniel Grubstick (1 episode)

Dave Fisher

Walter Morgan (1 episode)

Richard Simmons (1 episode)

Walter Morgan / John Fox (1 episode)

Ernst

Larry (2 episodes)

Danny

Mike Tappin

Mr. Pritchett

Jack Lessenberry

Gary

Principal Roy

Pete

The Wizard (1 episode)

Rolf (4 episodes)

(voice)

Mr. Enright (1 episode)

Dr. Rod Daniels (1 episode)

Max Paulson (1 episode)

Gary (4 episodes)

Damon Lafleur (1 episode)

Dr. Besman

Cafe Manager (1 episode)

Sarkissian (1 episode)

Binky Moore (1 episode)

Sadie's Manager

Educational Consultant

Simon Grim

Dr. James Pearn

(6 episodes)

Alex Scarvey

Lewis Croshere

The Ranger

Funk

Dr. Venture (voice) (81 episodes)

(1 episode)

Wade Donato (1 episode)

Professor Friend

Robert Crumb

Lab Technician

Roger Stern (1 episode)

Gallery owner (1 episode)

Druden Hunt

Rod Flexner

Simple Simon

Concierge

Martin

Agent Hopper

Olivier Di Santo

Harry

Poker Player

Buster (1 episode)

True Believer

Simon Grim

Isaac

Voice

James