children apologize to her for their acts, which breaks her heart. She understands that it is the nature of children to be mischievous and becomes their friend. She also understands how Natesan takes care of them despite his poor condition. Meanwhile, Natesan returns her advance amount by mortgaging his auto-rickshaw and asks her to vacate the house. But Meenakshi and the children manage to change his mind and let her stay. Except for the small fights, both Natesan and Meenakshi are attracted towards each other. Natesan is frequently visited by an old "Mental" looking old man who demands money from Natesan most of the time. Natesan is irritated by his acts, and yet he supports him with the money. The old man is actually a scientist who has invented many things. Natesan gets angry that the old man cheated on him once, visits his home and is surprised to see all the inventions. The old man explains that he is inventing the machine which makes people invisible. He also shows him a receiver which can receive abnormal frequencies powerful enough to intrude Indian defence. Natesan hears an intrusion that a famous scientist shall be killed by some people. So he rushes to the police station to warn them. The scientist is saved because of his warning. Hence he earns the enmity of Raja Bhupathy as he is behind the master plan of killing the scientist. Bhupathy's men sets off to find the receiver in Natesan's house and find that the receiver is with the old man. The old scientist finally invents the "invisibility" machine. But he is killed by Bhupathy's men. Before dying, he hands over the machine to Natesan and tells him to fight for justice in the country with this. Natesan and one of his children test the machine and sees that it works. Hence Natesan uses the machine and becomes invisible. He once saves Meenakshi from Bhupathy's men when she tried to find their truth and got trapped. The invisible man introduces himself as "Vaathiyaar" (nickname of Thiru M.G.R.) who has come back to the world to fight for justice. Soon Natesan gains fame as invisible "Vaathiyaar" due to his good deeds for society. Since he does good things and does not trouble the public and the government, the police do not arrest him. The child, who is the only person to know about Natesan's invisibility, finds