Guest star James Franciscus played Det. Jimmy Halloran in the TV series Naked City (1958) in the first season (1958 - 1959). After he left the series, Paul Burke replaced Franciscus as Det. Adam Flint (1960-1963). This is similar to the way Burke as Colonel Joe Gallagher replaced Robert Lansing as Brigadier General Frank Savage as lead character in the first episode of the second season of 12 O'Clock High.
James Franciscus's father, US Army Air Force pilot Captain John Allen Franciscus, was killed in a plane crash in 1942 during World War II, as a passenger on a small transport with other pilots sent from Washington DC to a bomber base in Maine to ferry bombers to the European Theater. James was eight at the time.