LeGault's mother, Mary, was born in Illinois, the daughter of immigrants from the Austro-Hungarian Empire.

He received a full football scholarship to the Municipal University of Wichita, where he majored in business administration for two years before dropping out to pursue a music career.

(1962) in which he was a stunt double for Elvis Presley, Kissin' Cousins (1964), and Viva Las Vegas (1964).

LeGault was on screen in a variety of programs including the short lived series Werewolf in 1987.

[8] He made many guest appearances on television series, his appearances ranged from The Rockford Files (episodes "Claire" and "A Deadly Maze"), Gunsmoke, Barbary Coast, Logan's Run, Police Woman, Battlestar Galactica, The Incredible Hulk (episode "The Antowuk Horror"), Wonder Woman, Buck Rogers in the 25th Century, The Dukes of Hazzard (episode "The Runaway"), T. J. Hooker, Tales of the Gold Monkey, Voyagers!, MacGyver, Simon & Simon, Sledge Hammer!, Star Trek: The Next Generation, Renegade and Crusade.

On the Knight Rider season 1 DVD pilot commentary, creator Glen A. Larson mentioned that Lance LeGault had "a voice that was four octaves lower than God's."

LeGault's trademark voice was at one point featured on self-guided tour cassettes at Elvis Presley's Graceland in Memphis, Tennessee.

He lent his deep bass voice as Junior the Buffalo in Disney's Home on the Range (2004).

What’s more, he voiced Yank Justice in the nine-episode, 30-minute 1985 series Bigfoot and the Muscle Machines, part of Marvel Productions' Super Sunday block.