After a lightning bolt zaps a robot named Number 5, the lovable machine starts to think he's human and escapes the lab. Hot on his trail is his designer, Newton, who hopes to get to Number 5 before the military does. In the meantime, a spunky animal lover mistakes the robot for an alien and takes him in, teaching her new guest about life on Earth.
An alien slave crash-lands in New York City while being pursued by two Men in Black bounty hunters. His attempt to find a place for himself on Earth parallels that of the immigrant experience.
Wealthy Sunny von Bülow lies brain-dead, husband Claus guilty of attempted murder; but he says he's innocent and hires Alan Dershowitz for his appeal.
Robot Johnny 5 moves to the city to help his friend Ben Jahrvi with his toy manufacturing enterprise, only to be manipulated by criminals who want to use him for their own nefarious purposes.
Along with his new friends, a teenager who was arrested by the US Secret Service and banned from using a computer for writing a computer virus discovers a plot by a nefarious hacker, but they must use their computer skills to find the evidence while being pursued by the Secret Service and the evil computer genius behind the virus.