Twin films are nothing but a pair of films which deliver a same or a very similar story or plot to the audience. The movies are generally released close to each other. In an industry like Hollywood/Bollywood which offer a plethora of movies every now and then, the study of crucial factor in determining if the movie will be a hit on the box office is of utmost importance. Especially when it comes to the case of twin movies it plays a vital role as one really needs to grab the maximum attention of the audience towards their movie, against the other. In the following paper we will be discussing about these crucial factors based on the two case studies of the twin movies.