Don Adams Maxwell Smart, Agent 86 Actor Barbara Feldon Agent 99 Actor Edward Platt Thaddeus, the Chief Actor Robert Cornthwaite Guest Star Leonard Strong Guest Star Judy Lang Guest Star Bryan O'Byrne Guest Star Harold J. Stone Guest Star Charles Lane Guest Star Ted Knight Guest Star Victor French Guest Star Frank De Vol Guest Star Gregg Palmer Guest Star Paul Lukather Guest Star Lee Kolima Guest Star Robert Karvelas Guest Star Milton Selzer Guest Star Jack Donner Guest Star Don Brodie Guest Star Roberto Contreras Guest Star Leonard Stern Executive Producer, Writer Stan Burns Writer Gerald Gardner Writer Arne Sultan Writer Mel Brooks Writer Pat McCormick Writer Mike Marmer Writer Dee Caruso Writer David Alexander Director Marvin Worth Writer Ron Friedman Writer Buck Henry Writer Bruce Bilson Director Frank McDonald Director Gary Nelson Director Murray Golden Director Paul Bogart Director Richard Donner Director Don Richardson Director