Which former MLB player guest-stars as himself in “The Boyfriend”?

“Which former MLB player guest-stars as himself in ‘The Boyfriend’?” — Keith Hernandez guest-stars as himself.

Hernandez appears as a fictionalized version of the former New York Mets first baseman. Jerry meets him in a locker room, and their friendship becomes the center of the episode’s two-part story. Elaine also becomes involved with Hernandez, creating comic tension for Jerry.

“The Boyfriend” draws heavily on baseball history, especially the Mets’ 1986 championship season. Jerry wants to discuss Hernandez’s performance in Game 6 of the 1986 World Series, while Kramer and Newman insist Hernandez once spit on them outside Shea Stadium.

The episode’s famous “magic loogie” sequence parodies the conflicting accounts of that alleged incident. Darryl Strawberry was considered in an earlier version of the storyline, but Keith Hernandez is the actual guest star and the player portrayed throughout the episode.