Which Cheers episode marks Frasier Crane's first appearance?

“Which Cheers episode marks Frasier Crane's first appearance?” — “Rebound (Part 1)” marks Frasier Crane's first appearance.

The episode is the season-three premiere of Cheers, which first aired in 1984. Frasier was introduced as Diane Chambers's new romantic partner and as an intellectual rival to Sam Malone. He was originally intended to appear in only a few episodes, but Kelsey Grammer's performance impressed the producers and the character became a major part of Cheers.

The title can cause confusion because “Rebound” is a two-part storyline. Frasier first appears in “Rebound (Part 1),” not “Rebound (Part 2)” and not “The Triangle.” His introduction begins the storyline in which he helps Sam deal with alcoholism while becoming involved with Diane.

Frasier later married Lilith Sternin on Cheers and became the central character of the spin-off Frasier, which premiered in 1993. The character was played by Grammer in Cheers, Frasier, and the 2023 revival.