Darna Zaroori Hai is a horror film that has six separate episodes that end up to a common climax.
1. A slightly overweight grown up lad, still living at home, watches every new movie on the first night it's released. As he's heading out to watch the most recent release, from director Ram Gopal Varma no less, he's cautioned by his mother not to take the short cut through the graveyard but he does.
2. A student arrives at a professor's house for help with his studies. The professor (Amitabh Bachchan) is convinced that there's someone else in the house with the two of them. The student can't see anything and fears that his professor has gone somewhat loopy until...
3. It's a dark and stormy night when a passing car breaks down and its driver, Arjun, comes to the door of a spooky mansion seeking help. He's welcomed in by a very lovely young woman (Bipasha Basu). She and her husband are both rather kooky and keep stalling his efforts to ring a mechanic for assistance. Talk turns to the calling of spirits of dead people, and Arjun disbelieves their ability to summon spirits.
4. A young couple (Suniel Shetty and Sonali Kulkarni) are visited by a strange and rather persistent life insurance salesman. Despite the husband's ever increasing objections, the salesman refuses to leave. Finally push comes to shove, literally, resulting in someone's death.
5. A story about a movie director (Anil Kapoor) who is keen to release a horror movie and decides he would like to work on the project in isolation in his home far away from the city. En route to his hideaway he picks up a rather lovely young hitchhiker (Mallika Sherawat) who seems rather impressed that she has been picked up by such a well known director.
6. It's a rainy night when a young man driving along a highway, whilst drinking and chatting on a mobile, swerves and just avoids colliding with a young woman in the middle of the road. He wakes up the next morning to find himself in jail, accused of murdering a man. Of course he protests loudly and insists he is innocent, something that the Inspector refuses to believe. The the victim's mother turns up, and is allowed in to see him and that's when secrets from the past come forth, revealing a lot more than expected.