Poll: Celebrities Who Appeared on "Rick and Morty"

Rick and Morty (2013) is an American adult animated sci-fi comedy series created by Justin Roiland and Dan Harmon for Cartoon Network's Adult Swim. The show has received universal acclaim from critics and fans alike as one of the most inventive shows ever to grace television. As a result, the series has attracted the likes of many celebrities. Which of these celebrities made the best appearance on the show? After voting, you may discuss the poll here.