Liam Sullivan (May 18, 1923 – April 18, 1998) was an American actor, singer and comedian. Sullivan was born in Jacksonville, Illinois.
Over his acting career, Sullivan played many roles in multiple television series. He and Angie Dickinson appeared together in the episode "Point of Honor" of the syndicated American Civil War drama Gray Ghost. He guest starred as Jason Douglas in the 1960 episode "The Target" of the syndicated western series Tombstone Territory, with fellow guest star Warren Oates. He appeared as Patrick Henry in the Daniel Boone episode "Love and Equity", Nexus in the Lost in Space episode "His Majesty Smith," Mr. Willis in Knots Landing, Dr. Burt Hammond in St. Elsewhere, and Mr. Plenn in Falcon Crest and he played the prosecuting attorney in the Hill 256 Episode of Combat!. In the 1968 Dragnet episode "The Big Prophet" Sullivan gave a tour de force performance as his character, "Brother William," held forth for the entire half hour on the benefits of LSD and marijuana, while Joe Friday argued the opposing view.
Sullivan also appeared in movies such as That Darn Cat! as Graham and The Magic Sword. He is perhaps best remembered today for his role as the supremely
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