Overview: Colonel Humphrey Flack is an American sitcom which ran Wednesdays at 9pm ET from October 7, 1953 to July 2, 1954 on the DuMont Television Network, then revived from 1958 to 1959 for first-run syndication. The series also aired under the titles The Fabulous Fraud, The Adventures of Colonel Flack, and The Imposter.