"Deewana" is a tale of how the lives of two men can become so interlaced despite them hardly knowing each other. The story revolves around Kajal,(Divya Bharati), a young girl who is starry eyed over an innocent youth named Ravi (Rishi Kapoor). The two eventually marry in hopes of starting their joint life. Tragedy strikes as Ravi's greedy uncle (Amrish Puri)is hell bent on laying sole claim to the family's fortune and murders Ravi, leaving Kajal widowed and destitute.

Alone in a new city with no one to lean on, Kajal finds love again in the form of a young "Deewana" (Shahrukh Khan). Thinking again she will be happy, Kajal is dealt another bad hand by fate as Ravi is found to be alive by her new husband. Having lost his love to another, Ravi's only goal now is revenge! How he takes revenge?