It was designed as a starring vehicle for Ronnie Schell, who had proven to be fairly popular as "Duke", one of Gomer's buddies, in the hit program Gomer Pyle, USMC over the three previous seasons. Schell's character, Larry Clarke, was a morning disc jockey and part of a morning drive-time team, "Lewis and Clarke", on a smallish AM radio station in Los Angeles. The show also starred Joby Baker, who was known for guest starring in many sitcoms. The show's creators were Carl Reiner, Sheldon Leonard, Bill Persky, and Sam Denoff, all of whom had worked on The Dick Van Dyke Show, and was inspired by Persky & Denoff's personal experiences working as continuity writers for several disc jockeys on radio station WNEW in New York during the 1950s. In fact, William B. Williams, one of the station's most popular deejays, received screen credit for originating the show's title (adapted from his famous opening greeting, "Hello, World!").
Despite having the long-established and popular Red Skelton Show as a lead-in, and the young Goldie Hawn as a minor neighbor character, the show did not do well on Nielsen ratings and Schell returned to Gomer Pyle as Duke for the next season, which was also the show's last.