A scientist (director Rakesh Roshan) invents a computer to send sounds into outer space. Using the sound "Aum," he makes contact with an alien life form, but his fellow scientists laugh at his claims. Despondent, he drives home with his wife (Rekha). A spaceship interrupts their journey, and causes the excited Sanjay to crash. He is killed and his unborn child is injured in the accident. Rohit (Bollywood heartthrob Hrithik Roshan) grows up brain-damaged. He's stuck in a class with much younger kids and longs to advance academically, but he continually flunks. On top of that, he and his young friends are frequently bullied by Raj (Rajat Bedi) and his gang of thugs. Then Nisha (Preity Zinta), a beautiful young woman, moves to town. After a couple of comic misunderstandings, Nisha takes an interest in Rohit. Rohit asks Nisha to teach him computers, and they dig up his father's old device, inadvertently sending another message into space. Soon, another ship arrives, and this time, a funny little blue alien is left behind. Rohit takes the little one in, and soon finds himself being magically healed. Suddenly, he can see without his glasses, and soon he develops a quick mind and superhuman strength. Not only that -- he can dance. So he and his friends call the alien "Badoo." Raj grows jealous of all the time Nisha is spending with Rohit. He finds that now Rohit is strong enough to defend himself. But the authorities are searching for Badoo, and Rohit is determined to keep his little friend safe, no matter what the cost. Director Rakesh Roshan last directed his son, Hrithik, in Kaho Naa...Pyaar Hai, the film that made him a star. The big-budget Koi...Mil Gaya was promoted as the first science fiction film to come out of Bollywood.