Badi Dooooor Se Aaye Hai is a story of an extraterrestrial family who come to earth with an aim to find their eldest and lost son, named 2015, whom they have been searching for on many planets.
Their spaceship crashes in a jungle as they accidentally land on earth. On landing, they are shocked to see human's civilization and its form. Later they realize that if they move around in their alien form they will be treated differently or may be taken captive for research and analysis, thus risking their existence. But since they get very strong clues of their lost son to be living on earth, they forcefully take the form of humans and secure their lives. Due to an accident they reach sunshine colony, which becomes their residents while they are on earth. While they are in the colony Sharad Ghotala falls in love with Anna D'souza without realising that she is engaged to Captain Manav Ojha. They then make friends and adapt into the human civilization, thus carrying their search on for their lost son, eventually they find their lost son 2015.