Rick and Morty
Celebrity Voice Actor in this series.- David Cross of Mr. Show and Arrested Development fame plays the Zigerion leader in "M. Night Shaym-Aliens!"
- Claudia Black can be heard as an alien queen on Gazorpazorp and Ventriloquiver in "One Crew Over the Crewcoo's Morty".
- Alfred Molina plays Mr. Needful.
- Jerry's father is voiced by Dana Carvey.
- Key and Peele play the testicle monsters in "A Rickle in Time".
- Jemaine Clement is Fart in "Mortynight Run".
- Keith David is Reverse Giraffe in "Total Rickall" and President Curtis.
- Mike McLintock is Sleepy Gary from "Total Rickall".
- Kurtwood Smith is General Nathan in "Get Schwifty".
- Stephen Colbert is Zeep Xanflorp in "The Ricks Must Be Crazy".
- Jim Rash is Glexo Slimslom, the couples therapist in "Big Trouble in Little Sanchez".
- Werner Herzog and Gary Cole are the old wheelchair-bound alien and the alien doctor in "Interdimensional Cable 2: Tempting Fate".
- John Oliver, several months before Last Week Tonight with John Oliver, was Dr. Xenon Bloom.
- Nathan Fillion plays a Galactic Federation agent in "The Rickshank Redemption".
- Patton Oswalt is Beta 7, the Hive Mind in "Auto Erotic Assimilation".
- Susan Sarandon plays Dr. Wong in "Pickle Rick" and "Star Mort Rickturn of the Jerri".
- Danny Trejo is Jaguar in "Pickle Rick".
- Christian Slater is Maximus Renegade Starsoldier in "Vindicators 3: The Return of World Ender".
- Lance Reddick is Alan Rails in "Vindicators 3: The Return of World Ender".
- Tony Hale is Eli, the apocalyptic warrior in "Rickmancing The Stone".
- Liam Cunningham and Matthew Broderick are Balthromaw and the Talking Cat in "Claw and Hoarder: Special Ricktim's Morty".
- Paul Giamatti is Story Lord in "Never Ricking Morty".
- Elon Musk appears as interdimensional counterpart Elon Tusk.
- Jim Gaffigan is Hoovy in "Mort Dinner Rick Andre".
- Steve Buscemi is Eddie the Tina-Teer in "A Rick-Convenient Mort".
- Peter Dinklage is the Hans Gruber Alien in "Roy: A Mort Well-Lived".
- Jason Mraz and Lisa Kudrow are the Brachiosaurus God and the Tyrannosaurus Rex God along with Dan Harmon as the Triceratops God in "Juricksic Mort".
- Will Forte is the Pissmaster in "Analyze Piss".
- Jack Black and Daniel Radcliffe are two of the Solar Knights in "A Rick in King Mortur's Mort".
- Hugh Jackman Adam Westing as himself in "How Poopy Got His Poop Back".
