in 1948, kollmar made his first and only film appearance in the 1948 low-budget crime drama "close-up", directed by jack donohue. in june 1949, he began hosting the live television variety series "broadway spotlight". the series, which aired on nbc, was canceled in september 1949. throughout the early to mid-1950s, kollmar continued his career as an actor with guest roles on network television. in 1952, he became the master of ceremonies of "guess what" (american game show) on the dumont television network. it was telecast from july 8 to august 26, 1952, then was canceled, and no kinescopes were preserved. from 1952 to 1965, kollmar made five appearances on the game show "what's my line?", on which his wife was a regular panelist. kollmar appeared once as an occupational guest, twice as part of a group of mystery guests and twice as a panelist. the episode that aired live on july 6, 1952, first of his five appearances, was lost due to wiping, but the other four are available for viewing.