Hank Venture/The Monarch
Christopher McCulloch
Dr. Girlfriend / Henchman 21 (voice)
Doc Hammer
Dean Venture
Michael Sinterniklaas
Dr. Venture (voice)
James Urbaniak
Brock Samson
Patrick Warburton
Dr. Orpheus (voice)
Steven Rattazzi
Triana Orpheus (voice) / Jeanie (Mrs. Tom) (voice) / Princess Tinglepants (voice)
Lisa Hammer
Sirena (voice) / Receptionist / Kate (voice)
Cristin Milioti
Dr. Jonas Venture (voice) / Dr. Jonas Venture / Additional Voices (voice)
Paul Boocock
Action Johnny (voice) / Resistance 1 (voice) / Plastic Surgeon (voice)
Brendon Small
The Alchemist (voice) / President Breyer (voice)
Dana Snyder
Professor Impossible (voice) / Professor Impossible / Phage (voice)
Bill Hader
General Treister (voice) / Scaramantula (voice)
Toby Huss
The Master (voice)
H. Jon Benjamin
Professor Impossible (voice)
Stephen Colbert
Captain Sunshine (voice)
Kevin Conroy
Mandalay (voice) / Jefferson Twilight (voice)
Charles Parnell
Wonderboy (voice)
Patton Oswalt
Brown Widow (voice)
Nathan Fillion
Lance Hale / Mrs. Z (voice)
Seth Green