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