'Rick and Morty': Most Epic Celebrity Cameos

Key and Peele

Right off the bat, let's cheat and count two massive stars as one.

Keegan-Michael Key and Jordan Peele burst onto the mainstream together with their sketch comedy show Key and Peele. While they have gone their separate ways in many respects, they stuck together for their Rick and Morty cameo, as two fourth-dimensional beings who come to try and repair Rick's meddling with the time stream in Season 2, Episode 1.

Jemaine Clement

The Flight of the Conchords' Jemaine Clement had Rick and Morty fans wrinkling their nose when he played a telepathic, gaseous alien that Morty simply named Fart.

Clement also gave the show one of its most beloved musical numbers — the original "Goodbye Moonmen."

Patton Oswalt

Comedic legend Patton Oswalt technically played a whole race of characters when he joined Rick and Morty as the parasitic hive-mind Beta 7.

Oswalt's cameo was one of two in the episode "Auto Erotic Assimilation," where Christina Hendricks played another hive-mind, Unity, who was Rick's ex-girlfriend. The final scene found Unity hiding out with Beta 7 while Rick screamed drunkenly at their door.

David Cross

David Cross played a bumbling nemesis for Rick in the episode "M. Night Shaym-Aliens" back in Season 1. Cross has a storied career in Hollywood, and Rick and Morty co-creator Dan Harmon has often talked about how he was influenced by Cross at an early age on his podcast, Harmontown. In particular, he points to Mr. Show, a sketch comedy series starring Cross and Bob Odenkirk.

In honor of that, he bestowed some of the funniest lines in the whole show upon Cross, including two painfully embarrassing mentions of his alien anatomy.

Stephen Colbert

Stephen Colbert took a break from The Late Show to play the voice of Zeep Xanflorp, an alien scientist not unlike Rick in "The Ricks Must be Crazy." In the episode, Rick travels into a microscopic universe which he uses as a battery to power his spaceship, only to find that Zeep has done exactly the same thing.

Zeep even echoes a few of Rick's most infamous lines in so many words, and shares his penchant for unhealthy vices.

"I'm an alcoholic," Rick whispers as the two begin to make up.

"Opium addict," Zeep confides, and they both laugh.

Werner Herzog

Eccentric German director Werner Herzog appeared in Season 2's clip show episode "Interdimensional Cable 2: Tempting Fate." He played an elderly alien, speaking in his own grave tone about how human beings are obsessed with their own genitalia.

Harmon talked about working with Herzog on Harmontown. He confirmed that he had reached out to Herzog specifically for the role and had been starstruck in talking to the director.

"I've never met a famous person that was more, just exactly what you'd expect," Harmon said. "Which is not to say that he's predictable at all, because what you expect with Werner Herzog is that he's going to come in and be... Werner Herzog."

Nathan Fillion

Sci-fi icon Nathan Fillion had a cameo that may have been over-shadowed by the long-awaited episode it was embedded in. Fillion played the alien interrogator that goes inside of Rick's brain with him in the Season 3 premiere.

After waiting for years to see the new episode, fans may have been too excited to notice at first that the star of Firefly and Castle was speaking from the alien's insectoid lips. Luckily, the show bears re-watching.

Joel McHale

Joel McHale starred as the handsome, silver-tongued lead in Harmon's NBC sitcom Community, but he took on a very different role when he turned up for a cameo on Rick and Morty. McHale played Hemorrhage, leader of the Deathstalkers in an episode where Rick, Morty and Summer visited a Mad Max-style wasteland.

In the same episode, Veep's Tony Hale performed the voice of Eli, another denizen of the wasteland.

Susan Sarandon

Susan Sarandon has perhaps the most infamous cameo in all of Rick and Morty. She plays Dr. Wong, the therapist who is trying to work with the family while Rick turns himself into a pickle in "Pickle Rick." The episode later won an Emmy.

The cameo is a significant one, as the character of Dr. Wong was named by staff writer Jessica Gao. Gao and Harmon later co-hosted a podcast titled Whiting Wongs, where they discussed the tangled issue of racial and ethnic representation, both on-screen and in the writer's room, in Hollywood.

As they noted several times in the podcast's first season, Harmon and Gao decided to start Whiting Wongs after Sarandon's casting incensed Gao. She explained to Harmon and the producers that she had given the therapist that name in the hopes of securing a job for an Asian or Asian-American voice actress, of which she complained there were too few. When Harmon suggested that at least Wong would represent Asian-Americans on-screen, Gao attempted to educate him, leading to hours and hours of recorded discussion.

John Oliver

Finally, another Community alum, John Oliver, got on the Rick and Morty train early.

Oliver played the part of Dr. Xenon Bloom, and amoeba that Rick had partnered with the build Anatomy Park. The theme park was embedded within an old man's body, and Morty was forced to go inside and help the doctor try and save it.