Appu and Pappu movie is one of those movie that should be watched and enjoyed but one should not expect it to be logical all the time.In this movie, Appu is brought up by his single mother. He wants to know about his father, but his mother does not want to reveal anything about him. Appu's grandfather, however, tells him that his father now works in Cambodia as a manager in a big hotel. Now Appu wants to meet his father and an opportunity strikes when his mother has to go to Cambodia on work. Appu accompanies his mother but on the way, his bag gets exchanged. And a group of goons are on Appu's trail to get a pen drive that has some vital yet dangerous information. One of the criminals engages an orangutan to steal the pen drive. But Appu becomes friendly with the orangutan and even saves it from impending danger. How Appu reunites his parents in the process with the help of the orangutan and also saves the country from the ulterior designs of villains forms the rest of the story.