20 Celebrities You Didn't Know Appeared In Rick And Morty

20. Stephen Colbert - Zeep

First Appeared In Season 2 Episode 6 - The Ricks Must Be Crazy

After the battery of Rick's ship malfunctions, he and Morty decide to fix it by shrinking to microscopic size and entering it. While inside the battery, Morty learns it's powered by the denizens of a micro-universe. At least, it was. After one of the citizens, a scientist called Zeep, learns how to sustain their world with his own mini-universe, the people stopped powering the battery.

Even though Zeep is quite a memorable character, few viewers realised he was voiced by tv show host, Stephen Colbert. Colbert doesn't disguise his voice in any way but most viewers still didn't recognise him since they weren't use to hearing him speaking in such an arrogant and self-loathing manner.