Doc Hammer
Dr. Girlfriend / Henchman 21 (voice)
Christopher McCulloch
Hank Venture / The Monarch (voice)
Patrick Warburton
Brock Samson (voice)
James Urbaniak
Dr. Venture (voice)
Michael Sinterniklaas
Dean Venture (voice)
Steven Rattazzi
Dr. Orpheus (voice)
Paul Boocock
Dr. Jonas Venture (voice)
Lisa Hammer
Triana Orpheus (voice)
Dana Snyder
The Alchemist (voice)
Mia Barron
Molotov Cocktease (voice)
Charles Parnell
Jefferson Twilight (voice)
Brendon Small
Action Johnny (voice)
Mark Gagliardi
Rocco (voice)
Cristin Milioti
Sirena (voice)
Hal Lublin
Wide Wale / Manolo (voice)
Nina Hellman
Prostitute (voice)
Kate McKinnon
Redusa (voice)
Joanna Adler
Myra Brandish (voice)
James Adomian
S-464 (voice)
T. Ryder Smith
Baron Ünderbheit (voice)
Bill Hader
Phineas Phage / Headshot / Flying Squid (voice)
Toby Huss
General Treister (voice)
John Hodgman
Snoopy (voice)
Larry Murphy
Giorgos / L. Ron (voice)
Nathan Fillion
Brown Widow (voice)
Paul F. Tompkins
Blue Morpho (voice)
Clancy Brown
Red Death (voice)
H. Jon Benjamin
The Master (voice)
Stephen Colbert
Professor Impossible (voice)
Kevin Conroy
Captain Sunshine (voice)
Stephen DeStefano
Dr. Paul Entmann (voice)
Paget Brewster
Amber Gold / Vespertina / Councilman 11 / Waitress (voice)
Misha Collins
Prisoner 2 / Maestro Wave (voice)
Patton Oswalt
Wonderboy (voice)
Seth Green
Lance Hale / Mrs. Z (voice)
Steve Park
Mike Sorayama (voice)
Gillian Jacobs
Marsha Backwood (voice)
Jarboe
Maid (voice)
Rachel Feinstein
Barbie-Q / Barbara Qantas / Woman on Street (voice)
Reggie Watts
Delivery Guy (voice)