Swamy is experimenting with radioactive elements and accidentally conjures radioactive monsters. He causes a lizard and dragonfly to turn into monsters. Mighty Raju goes to rescue the lab and his father. He fights with the monsters and brings them to a spot where they were turned into monsters. Swami fires the radioactive beam and turns them back to their original state.
Sandhya is in a bad mood and snaps at Raju for being mischievous. She is upset that he has not tidied his room after his friends left. Raju is hurt and throws a tantrum. He takes Skatey and leaves with Mobi. Some terrorists interested in Swami's latest weapon break into Raju's home, overcome Cheeky and kidnap Sandhya in an effort to make Swami hand it over.
Cheeky and Mobi are home alone as Raju and his family leave for a special gathering when a couple of cute pups land up in the yard. They are messing about with the sprinklers in the yard when Cheeky reprimands them. However Mobi softens at their cuteness and lets them in the house, which is a big mistake.
Swami is called to Doragpa to study some radioactive reactions in the surrounding villages. Raju and Moby join him when Moby returns with the part of an artifact. The crew unearths a radioactive cannon ball that rings an alarm in the evil scientists lair. The evil scientists plan to destroy the world.
Raju hears about the mysterious sightings of a ghost and the subsequent disappearance of cattle near an abandoned fort outside Aryanagar. He goes with Moby to the fort only to find out that the ghost story was a hoax, spread by goons to divert people away from the fort so that they can smuggle arms and ammunition from there.
It is a lazy Sunday for Raju and Swami returns, announcing dinner plans with Sandhya at his colleague Dr. Bose's home. Among things they will discuss will be a formula that can be used to create artificial rain in the fields. Later that night, they leave for dinner but do not return. Raju is worried and wonders if Karaati's hand behind this. Mighty fights him and saves the day.