Shahenshah (1988)

When villains frame a police officer, he kills himself in shame. His son (Amitabh Bachchan) grows up to be a policeman as well, but one with two personalities. By day, he's an effeminate, corrupt, low-ranking cop. But by night, he's the one-man crime-fighting machine Shahenshah, who takes on criminals the law can't or won't touch and searches for the man responsible for his father's untimely death.