Felton made one cameo appearance in U.N.C.L.E., as a chess player in the party scene of the first season episode, "The Giuoco Piano Affair".
At this time, he was also executive producer of the Wendell Corey/Jack Ging/Ralph Bellamy medical drama focusing on psychiatry, The Eleventh Hour, which aired on NBC from 1962-1964 [REF].