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Veteran Hollywood song-and-dance man Dan Dailey essays one of his most unusual roles as Karate expert Dexter Lloyd Bayliss. Elliot Ness (Robert Stack) is suspicious when Bayliss, who is known to be "tight" with the mob, sets up a martial-arts classroom for teenage kids. As it turns out, Bayliss is teaching these impressionable youngsters how to become professional assassins for the Underworld...and he's very, very good at his job. This is the only episode of The Untouchables to be written by a woman itty Buhler).