Television
* The A-Team (1983-1987): LeGault is best known for his portrayal of "Colonel Roderick Decker," a recurring antagonist, throughout the series' run.
* Walker, Texas Ranger (1993-2001): He played the recurring role of "Captain "Iron" C. Davis" for the entire series.
* Magnum, P.I. (1980-1988): LeGault appeared in multiple episodes as various characters.
* Airwolf (1984-1987): He played "Colonel "Hawkeye" Henry" in several episodes.
* Knight Rider (1982-1986): He appeared as various characters in several episodes.
* The Dukes of Hazzard (1979-1985): LeGault appeared in several episodes as different characters.
* The Fall Guy (1981-1986): He appeared in several episodes as different characters.
* Murder, She Wrote (1984-1996): LeGault appeared in several episodes as various characters.
* Baywatch (1989-1999): LeGault made a guest appearance in one episode.
Movies
* The Running Man (1987): LeGault played "Captain "Dynamo" Franklin" in this sci-fi action film starring Arnold Schwarzenegger.
* Predator (1987): LeGault played "Dillon" in this action film starring Arnold Schwarzenegger.
* The Last Boy Scout (1991): LeGault appeared as "Big Al" in this action film starring Bruce Willis.
* The Adventures of Ford Fairlane (1990): LeGault played the villainous "Mr. Big" in this comedy action film starring Andrew Dice Clay.
This is not an exhaustive list, as LeGault appeared in many other television shows and films throughout his career. However, it highlights some of his most memorable and prominent roles.