France Nuyen, born France Nguyen (b. 1939), played Mamu in the Six Million Dollar Man episode "The Coward."
Due to being half-Vietnamese and half-French, Nuyen was often called upon to play Asian or otherwise exotic roles in American television and film, beginning with her debut in the 1958 musical South Pacific. During the 1960s she appeared in a variety of series, ranging from I Spy (she was in fact married to its star, Robert Culp, for several years), to the original Star Trek in which she appeared as Elaan of Troyius.
She also appeared in several different roles in Hawaii Five-O and Fantasy Island, and landed her only ongoing series role in the mid-1980s on St. Elsewhere. She continues to act, and the IMDb lists her most recent film credit in 2008.