Justin Roiland
Rick Sanchez / Morty Smith (voice) (12 eps)
Chris Parnell
Jerry Smith (voice) (10 eps)
Spencer Grammer
Summer Smith (voice) (10 eps)
Sarah Chalke
Beth Smith (voice) (10 eps)
Dan Harmon
Additional Voices (voice) (10 eps)
Kari Wahlgren
Additional Voices (voice) (7 eps)
Maurice LaMarche
Hephaestus (voice) (5 eps)
Cassie Steele
Tammy Gueterman (voice) (5 eps)
Nolan North
Additional Voices (voice) (4 eps)
Sherri Shepherd
Tony's Wife (voice) (2 eps)
Pamela Adlon
Angie Flynt (voice) (2 eps)
John DiMaggio
Bully #2 (voice) (2 eps)
Brandon Johnson
Mr. Goldenfold (voice) (2 eps)
Echo Kellum
Additional Voices (voice) (2 eps)
Alan Tudyk
Observant Glorzo (voice) (2 eps)
Nick Reczynski
Snake Humanoid (voice) (2 eps)
Phil LaMarr
Additional Voices (voice) (2 eps)
Tom Kenny
Shadow Jacker (voice) (2 eps)
Keegan-Michael Key
Fourth-Dimensional Being (voice) (1 eps)
Paul Giamatti
Storylord (voice) (1 eps)
Christopher Meloni
Jesus Christ (voice) (1 eps)
Clancy Brown
Vengeful Train Passenger (voice) (1 eps)
Taika Waititi
Glootie (voice) (1 eps)
Matthew Broderick
Talking Cat (voice) (1 eps)
Susan Sarandon
Dr. Helen Wong (voice) (1 eps)
Liam Cunningham
Balthromar (voice) (1 eps)
Dustin Ybarra
Danny Publitz (voice) (1 eps)
Jeffrey Wright
Tony (voice) (1 eps)
Kathleen Turner
Monogatron Queen (voice) (1 eps)
Sam Neill
Monogatron Leader (voice) (1 eps)
Elon Musk
Elon Tusk (voice) (1 eps)
Justin Theroux
Miles Knightly (voice) (1 eps)
Claudia Black
Ventriloquiver (voice) (1 eps)
Daniel Bonjour
Additional Voices (voice) (1 eps)
Keegan Allen
Partygoer (voice) (1 eps)
Eddie Pepitone
Additional Voices (voice) (1 eps)
Aislinn Paul
Nancy (voice) (1 eps)
Chris Romano
Weird-faced Teen (voice) (1 eps)
Tara Strong
Female Disguise / Story Train Computer (voice) (1 eps)
Eric Bauza
Shane (voice) (1 eps)
Rob Schrab
Additional Voices (voice) (1 eps)
Lauren Culjak
Additional Voices (voice) (1 eps)
Ryan Ridley
Additional Voices (voice) (1 eps)
Vanessa Marshall
Additional Voices (voice) (1 eps)