By Clark Collis
Updated August 26, 2015 at 05:08 PM EDT
Adult Swim

On Sunday’s episode of Rick and Morty, Stephen Colbert finally gets to play someone as intelligent as his blowhard character on The Colbert Report believed himself to be. Specifically, the Late Show host-in-waiting portrays Zeep Xanflorp, an alien with grey matter (or whatever substance makes up his brain) on a level with that of mad scientist Rick.

“They’re pretty equally matched,” says Justin Roiland, who voices both of the sci-fi sitcom’s titular characters and cocreated the show with Dan Harmon. “It’s interesting to watch Rick be insecure and s–tty about the fact that he knows this guy is pretty f—ing smart.”

Rick and Morty airs Sundays at 11:30 p.m ET on Adult Swim. Check out an exclusive clip featuring Colbert’s Zeep Xanflorp above.

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