Wendy Jo Sperber, the actress best known for playing Marty McFly’s sister in the Back to the Future films, built a career defined by comedic energy and warmth. But her life off-screen included a private battle with breast cancer that turned her into a source of support for countless other patients. Born on September 15, 1958, in Los Angeles, Sperber grew up in a Jewish family with her parents, Burton and Charlene, and three siblings. She was drawn to performing early and trained at the Teenage Drama Workshop at California State University, Northridge before entering the industry as a teenager.
Her film debut came at age 19 in 1978’s Corvette Summer alongside Mark Hamill. That same year she starred in I Want to Hold Your Hand as a frantic Beatles fanatic, a performance that earned praise for its manic enthusiasm. She also appeared uncredited as a dancer in Grease and had a small role in Steven Spielberg’s 1941. In 1980, she took on the role that made her a recognizable face on television: Amy Cassidy on Bosom Buddies.
The sitcom ran until 1982 and paired her with Tom Hanks and Peter Scolari, with her character knowing the secret behind the two leads’ cross-dressing scheme. She later joined the cast of Private Benjamin from 1982 to 1983. Her film career continued through the 1980s with appearances in Bachelor Party, again with Hanks, and Moving Violations. In 1985, she played Linda McFly in Back to the Future, and she reprised the role in Back to the Future Part III in 1990.
Other credits included Stewardess School, The Image, Desperate But Not Serious, and Sorority Boys. On television, she starred in the sitcom Babes from 1990 to 1991 and had a key role on Hearts Afire from 1992 to 1993. She also guest-starred on shows including Will & Grace and Home Improvement, with a later credited appearance on an episode of American Dad after her death. Sperber married producer Richard Velasquez in 1983.
The couple had two children, son Preston and daughter Pearl, before divorcing in 1994. She remained a devoted mother while continuing to work in Hollywood. In 1997, at age 39, she was diagnosed with breast cancer. She went into remission, but the disease returned and metastasized by 2002.
Even while undergoing experimental treatments, including brain radiation in 2004, she continued working and turned her experience into advocacy. She founded the WeSpark Cancer Support Center in Sherman Oaks, California, which provided free emotional support, information, and activities for cancer patients and their families. She served on the board and wrote the organization’s newsletter, emphasizing the importance of peer support. In a 2004 interview, she spoke about helping others feel less alone during their treatment.
Wendy Jo Sperber died on November 29, 2005, at her home in Los Angeles. She was 47 years old. She is buried at Mount Sinai Memorial Park Cemetery.
WeSpark continues to operate, and her work on screen remains widely remembered.