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Episode 6, “Welcome to Heaven,” sees Criss joining the cast as Saint Peter, known in Christianity as one of the founders of the Christian Church, who guards the pearly gates to Heaven. In the episode, Charlie and her girlfriend Vaggie (Stephanie Beatriz) visit Heaven to have a meeting about the Hazbin Hotel and the impending Extermination.

Criss, who won an Emmy and Golden Globe Award for his lead role in The Assassination of Gianni Versace, makes an early appearance in the episode and lends his dreamy voice to the disco-pop song “Welcome to Heaven,” by Sam Haft and Andrew Underberg.

The musical number features Saint Peter giving Charlie and Vaggie a tour of Heaven, pointing out that there are “no burglaries” and “everyone is hot.” How charming!

Criss is notorious for singing on the small screen after having his breakthrough role in the Fox musical comedy Glee, where he covered hit songs, such as “Teenage Dream,” “Raise A Glass,” and “Somebody That You Used to Know.” He went on to appear in the musical episode of The Flash, reuniting with his former Glee costars Grant Gustin and Melissa Benoist.