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The movie Command Approved, where Gavan played an arms dealer was released in the United Kingdom as Action Stations!
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Val Kilmer: (in contrast to working with the 4-foot Nelwyns in Willow) It was a little strange, however, when I worked with Airk Thaughbaer (Gavan O'Herlihy), the leader of the rebel army. After weeks of looking down, I suddenly had someone to look up to.
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Gavan is one of five children.
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Gavan's mother is Elsa Bennett.
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Gavan is precisely one year older than comedian Jerry Seinfeld.
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Gavan grew up near the Elstree Studios in England, where Willow was filmed.
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Gavan was re-united with TV brother Ron Howard, who directed the movie Willow.
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Gavan's largest film role was Airk Thaughbaer in Willow.
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Gavan's nephew is actor Colin O'Herlihy.
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Gavan's father Dan is TV director Michael O'Herlihy.
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Gavan's brother Cormac married actress Cornelia Hayes.
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Gavan has a brother Cormac, and a sister Patricia.
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Most of Gavan's 30-plus film credits are for villain roles.
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Gavan's character Chuck is Richie's older brother. But in real life, Ron Howard is two months older than Gavan.
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Gavan's father is actor Dan O'Herlihy.
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As a child in Ireland, Gavan was a championship tennis player.
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Gavan stands 6'3" tall.
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Gavan appears as Card #9 in DuoCard's Happy Days collection.
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Gavan's name is often misspelled "Gavin."