Ian Hendry made his final appearance as Dr. David Keel in this episode, which originally aired on in the December 30, 1961. Steed and Keel go after unscrupulous businessman Lemuel Potts (John Bailey), who has a habit of crushing those less powerful than he. The latest victim is an elderly packager who was cheated out of a shipment of bananas. In true Avengers fashion, the good guys beat the villain at his own game -- several times over. First telecast December 23, 1961 (though it was videotaped several months earlier), "A Change of Bait" was written by Lewis Davidson. ~ Hal Erickson, Rovi