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Glenn had two of his teeth accidentally knocked out by Rita Hayworth in filming their fight scene for Gilda (1946).
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Glenn tried out for the role of Antiochus 'Tony' Wilson in Seconds (1966) but lost out to Rock Hudson.
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Glen served with the Marine Corps in World War Two starting in 1942, and was a Naval Reserve officer after the war that attained the rank of Captain. He served on goodwill tours in Korea and Vietnam, entertaining the troops.
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Glenn's son, Peter, is also an actor, and Eleanor Powell was his mother.
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Glenn won the Golden Apple award for Most Cooperative Actor twice, in 1948 and 1957.
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Glen was nominated twice in 1957 and 1958 for the Golden Globe award for Best Motion Picture Actor in a Musical or Comedy for The Teahouse Of The August Moon (1956) and Don't Go Near The Water (1957), and finally won in 1962 for Pocketful Of Miracles (1961).
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Glenn became a naturalized citizen of the United States in 1939.
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Glenn enjoyed collecting different kinds of salt and pepper shakers.
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Glenn was given the Golden Boot award in 1987 for his contributions to Western/cowboy films.
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Glenn has a star on the Hollywood Walk Of Fame at 6933 Hollywood Boulevard, Los Angeles, CA.
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Glenn offered to buy the Atlanta Flames hockey team in 1980, to keep the team in Atlanta, but was outbid by Nelson Skalbania, who took the team to Calgary, Alberta to become the Calgary Flames.
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Glenn was considered for the role of Max Schumaker in Network (1976) but was passed over due to his lack of box office presence in several decades.
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Glenn turned down a role in Oliver Stone's film JFK (1992).
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Glenn had been kicked on the right side of the face by a horse and often insisted that he be filmed from his left, thinking it was his only camera-worthy side.
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Glenn was 5 feet 11 inches tall.
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Glenn is a direct descendent of U.S. President Martin Van Buren.
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Glenn's most popular role among modern audiences was Johnathan Kent, adoptive father of Clark Kent aka Superman, in Superman (1978).
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Glenn was known as the fastest draw in Western pictures, able to unholster his gun in 0.4 seconds, faster than John Wayne and James Arness.
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Glenn was inducted into the National Cowboy Hall of Fame in 1978.
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Glenn was a relative of Sir John A. Macdonald, first Prime Minister of Canada.
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Glenn was awarded the French Legion Medal of Honor for his service in World War Two in 1992.