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In this MST3K short from 1947, the titular Johnny escapes from his parents at the Canadian National Exposition and meets boxer Joe Louis, comedians Olsen & Johnson, and the former Canadian prime minister. (As seen in Experiment 90, "The Rebel Set.")
Michael J. Nelson
Mike Nelson
Kevin Murphy
Tom Servo (voice) / Professor Bobo
Bill Corbett
Crow T. Robot (voice) / Observer
Mary Jo Pehl
Pearl Forrester