The iconic sci-fic film Mr India starring Anil Kapoor was originally written for Amitabh Bachchan.
The film was also scripted keeping in mind Amitabh Bachchan's voice but Big B refused to be a part of the film and to do the 'invisible' role.
Well, Anil Kapoor lapped the offer afterwards and the film proved to be a landmark in his career.
Strange that the invisible act made Anil’s career so visible!!!