Which actor voices Dr. Xenon Bloom in Anatomy Park?

John Oliver voices Dr. Xenon Bloom in “Anatomy Park.” Bloom is an amoeba and one of the central figures in the season-one episode, helping oversee Rick’s bizarre theme park built inside a homeless man named Ruben.

“Anatomy Park” is the third episode of Rick and Morty and sends Morty inside Ruben’s body, where the attractions are based on human anatomy. Dr. Bloom presents the park as an ambitious medical and entertainment project, but the facility quickly becomes dangerous when its systems fail and diseases escape. Bloom works with Rick and the other staff members to survive the collapsing park.

Oliver’s performance is a notable early celebrity guest appearance in the series. Viewers may recognize his voice from his work as a comedian and host, but the character is not a version of Oliver himself: Bloom is a fictional amoeba, complete with a medical role and a doomed attempt to save the park.

The other listed actors voice different characters elsewhere in the franchise. Gary Anthony Williams, Rob Paulsen, and Dana Carvey are all associated with separate Rick and Morty roles, not Dr. Bloom.