[1][2] Morris's first role came at the age of 10 when she was part of the cast of the television episode "Picture of the Magi" a Family Theater production which aired about 1957 on the Mutual Broadcasting System in the United States.
[3] Returning to Australia, Morris's next role was not to come until she reached the age of 20 when, in 1967, she worked on the ABC television series, Bellbird.
[4][5][6] Morris then played the part of Sam in the 1978 movie In Search of Anna, before receiving top billing as the wife Jill Cowper in the 1979 black comedy The Plumber, which began its life as a small 6 week television series directed by Peter Weir, but following its success was produced as a DVD titled The Mad Plumber.
She starred in Maybe This Time (1980), Strata (1983), Phar Lap (1983) as Bea Davis, the wife of Phar Lap's owner David J. Davis, and played the part of Catherine Faulkner, the mother of the main character, Kat Stanton, (played by Nicole Kidman) in Bangkok Hilton (1989).
She wrote an episode of Dinotopia in 2002, and then co-wrote Happy Feet (along with Warren Coleman, John Collee, and once again, George Miller).