Parks' first game show was "Party Line" on NBC (broadcast from New York City NBC flagship station WNBT), which involved viewers calling in to answer questions and win $5 prizes; "Party Line" ran from June 8 to August 31, 1947, making its one surviving episode the oldest known game show and one of the oldest surviving television shows to have been recorded. Commercial kinescopes did not come out until fall 1947 (co-sponsored by NBC, DuMont, and Kodak), and the only kinescopes known to predate "Party Line" are a few episodes of "Kraft Television Theater" from February and June 1947.