Ruick achieved success in radio prior to signing as a contract player with Metro-Goldwyn-Mayer. She was heard in the original radio version of Dragnet. She also recorded several songs for MGM Records. In the 1950s, Ruick starred as Kay in the first LP recording of the songs from George Gershwin and Ira Gershwin's 1926 Broadway musical, Oh, Kay!. This was a studio cast recording released by Columbia Records, and conducted by Lehman Engel. Despite what is sometimes claimed, it did not use the original orchestrations, but was the most complete recording of the score made up to that time. She landed a job on Hollywood Screen Test, a talent show which aired on ABC Television from 1948-1953. Ruick appeared on the Kraft Television Theater, soap operas, and The College Bowl (1950), which was hosted by Chico Marx. She also performed for fifteen weeks on the Jerry Colonna Show. In 1955 she was a regular on The Johnny Carson Show.