Debra Winger successfully auditioned and won the role of Sarah Connor. However, she later changed her mind and turned the role down. And see where her career went after An Officer and A Gentleman - NOWHERE!!
Gilda Radner, Susan Sarandon, Glenn Close, Rhea Perlman, Sigourney Weaver, Cybill Shepherd, Jane Seymour, Anjelica Huston, Lori Loughlin, Kim Basinger, Jodie Foster, Melanie Griffith, Christie Brinkley, Diane Keaton, Goldie Hawn, Jamie Lee Curtis, Ally Sheedy, Jessica Lange, Sissy Spacek, Kay Lenz, Liza Minnelli, Mia Farrow, Barbara Hershey, Miranda Richardson, Rosanna Arquette, Meg Ryan, Heather Locklear, Jennifer Grey, Madonna, Amy Irving, Teri Garr, Margot Kidder and Tatum O'Neal were all considered for the role of Sarah Connor before it was offered to Debra Winger. Christie Brinkley! Kim Basinger Heather Locklear!! Purrr!!
Daryl Hannah auditioned for the role of Sarah Connor, but turned it down in order to play Madison in Splash (1984). So glad she chose Splash instead!!
Sylvester Stallone was offered the lead role, but turned it down. GOOD!!
Randy Quaid was considered for the lead role. GOOD THING HE DIDN'T GET IT
Jennifer Jason Leigh was considered for the role of Sarah Connor, but director James Cameron feared she was too young for the part. She was later recast as Ginger but she was replaced at the last minute with Bess Motta. Jennifer always looked a bit psychotic to me in almost every movie!!
Julia Louis-Dreyfus was rumored to be cast as Sarah Connor but was forced to turn the role down due to her commitment as a regular player on NBC's "Saturday Night Live" (1975). She would Yadda Yadda Yadda The Terminator to Self Destruct!! LOL!!
Tom Selleck was rumored to be cast as The Terminator, but was forced to turn the role down due to his commitment to the TV series "Magnum, P.I." (1980). Kevin Kline and Michael Douglas were considered to play The Terminator. WHEW!! A Terminator with a Moustache!!

Debra Winger was James Cameron's preferred choice after he watched her in An Officer and a Gentleman (1982). Michelle Pfeiffer, Diane Lane and Carrie Fisher were all considered to play the part, and both Sharon Stone and Kelly McGillis auditioned for the role. Michelle or Sharon would had been good!! They were young and hot then!!
James Cameron revealed that Glenn Close was originally chosen to play Sarah Connor, but Close wasn't available prior to the project began. Thank God!!
James Cameron wrote the part of Sarah Connor as a teenage girl. It was rewritten as a twenty-something woman. Good thing; then Kyle would had been a pedophile! LOL!