The Buffybot, "Buffy the Vampire Slayer"
The fifth season of the TV series "Buffy the Vampire Slayer" introduced the "Buffybot," a cheerful robotic replica of the slayer, Buffy Summers (Sarah Michelle Gellar). A local vampire who was obsessed with Buffy forced a self-styled evil genius to build the bot, which later takes Buffy's place after she is killed saving the world. The bot's exceptional strength enables it to match Buffy's vampire-slaying prowess, but it falls somewhat short in delivering spontaneous witty quips as the vampires turn to dust, and while it can function independently it is incapable of feeling emotion or thinking for itself.
Annalee Call, "Alien Resurrection"
In "Alien Resurrection" (20th Century Fox, 1997), the fourth movie in the "Alien" franchise, Winona Ryder appeared as Annalee Call, a member of a spaceship crew who is revealed to be an auton — a synthetic human. She can interact directly with the control systems of the spaceship, which helps to save the crew at a crucial point during their battle with the xenomorph aliens.