The most successful movie in the history of Tamil cinema. Period.
A very tight, lean rehash of Hindi hit Hum, this movie catapulted Rajni into the stratosphere of superstardom. It firmly put him beyond the reach of any other star. Badsha is also important for another reason. It was during the jubilee celebrations of this movie that the seeds for Rajni's foray into politics were sown.
What made this movie such a big hit was the way the entire first half was built up to reveal that Rajni is actually a don.
Rajni, who had so far scripted all the tenets of action films, created a new one here, The hero can take a beating, but not heroism. This movie's success so overwhelmed Rajni that he decided to slow down. He began choosing his scripts with care, for he knew his fans would not accept anything that did not match Badsha in scale.