After a Universal Studios talent agent spotted her in 1972, Spang signed a 7-year contract with the studio. She then had a succession of guest-starring roles in television series including Emergency!, Adam-12 (Episode: Venice Division), The Streets of San Francisco, The Six Million Dollar Man, Happy Days, Chase, The Secrets of Isis, Charlie's Angels and Lou Grant. Spang also appeared in the television movies Short Walk to Daylight, Runaway! and Sarah T. - Portrait of a Teenage Alcoholic. She co-starred in a production of Winesburg, Ohio on KCET's Hollywood Television Theatre.