The reunion is to air Tuesday.
"Cast members will share behind-the-scenes stories from their days on the series, the episodes they most enjoyed and their favorite celebrity guest stars," a release said. "Jack Jones, who sang the original 'The Love Boat' theme song, will perform the song live for the studio audience. In addition, Gavin MacLeod will discuss his new book 'This is Your Captain Speaking: My Fantastic Voyage Through Hollywood, Faith & Life.'"
Set on the now-scrapped cruise ship "Pacific Princess," the show originally aired from 1977 to 1986.