In Tollywood movies I have noticed that some popular movies are?
It happens when the movie has to be dubbed in other languages. if Other language film makers think that the actors shown in original movie are not able to make huge impact on the odience, they decide to change the actors for the characters in the film for success parameters. Sometimes it makes success, sometimes not. for example: Wanted, Dabbang, Singham are the great success in bollywood. Chandan K