Muthu starring by rajinikanth and meena. A lavish Maharaja (Rajinikanth) lived with his sister-in-law and stepbrother Rajasekhar (Raghuvaran), helping people incessantly. His sister-in-law has a son, to whom the Maharaja bequeaths a major portion of his property. At this juncture, a new baby is born to the Maharaja.
His wife dies soon after. Brother Rajasekhar cheats the Maharaja as he fears that his son's property might be taken back and given to the Maharaja's own son. When the cheating comes to light, the Maharaja hands over all his property and his baby to his sister-in-law and brother and goes to the Himalayas, making his sister-in-law promise him that the baby should be brought up as a servant, not as a Maharaja. This baby is named Muthu (also Rajinikanth).
According to the promise tendered to the Maharaja, the son of the Maharaja's sister-in-law becomes a Prince (Sarath Babu) and Muthu works as his servant. A huge fan of drama, the prince regularly takes Muthu along with him wherever he goes. One day the Prince falls in love with a drama actress Ranganayaki (Meena). But Ranganayaki's heart lies with Muthu. Amidst all this, the Prince's Uncle (Radha Ravi), tries to capture all the property by killing everyone. But Muthu saves all and it is finally revealed that Muthu is the real Maharaja.