Kishore (kishore kumar) who is also known as funtoosh is an unemployed boy who stays along with his widowed mother and a little sister. Kishore falls in love with meena, who belongs to a rich family. Meena's father is a scientist. He is working on a secret formula, which is being sponsored by one of his businessman friends Mr Shyamlal (S. K. Shyam). Shyamlal's son Ranjan (anoop) wants to marry meena (kum kum). When ranjan learns that meena loves kishore, he purposely apoints him as a clerk in his dad's office and tries to create misunderstanding between kishore and meena. Shyamlal announces ranjan's angagement with meena, on ranjan's birthday. Kishore is upset to see meena keeping mum. Meena tells kishore that shyamlal is a bad man and he is forcibly making her dad work for that formula with the power of his money. When shyamlal's plan fails to trap meena, he sends his man to kill kishore, but smart kishore escapes safely and accidently enters the lab which belongs to meena's father. There he is zapped by is on eays, which turn him into a supernatural strong man. With the power of iron rays. Shyamlal fires kishore from the job. Kishore starts enjoying his new life with superpowers. But later his super powers wear off and he begins to shrink at a very rapid rate. On the other hand meena is being forced for the marriage with ranjan. The only way out of the situation is to get the essential property documents from shyamlal and arrange for twenty five thousand rupees to make a machine which will make kishore normal. Shyamlal threatens meena's father to allow this marriage otherwise return his money. Now, meena & kishore are trapped in the worst situation. How meena escapes the situation and how kishore gains his original personality is to be seen in the movie.