Namak Halaal

Bhim Singh (Suresh Oberoi) works as a manager and personal bodyguard to Seth Raja Singh (Kamal Kapoor) and saves him from many murder attempts planned by Rajas step brother, Girdhar Singh. One day Raja Singh appoints Savitri (Waheeda Rehman), Bhim Singhs wife as trustee to their property and guardian to his toddler son Raj Kumar. On the same day, he and Bhim singh die in the hands of Girdhar Singh. Savitri promises her husband that she would take care of Raj Kumar at any rate. Everyone including Bhim Singhs father Dashrath Singh (Om Prakash) blames Savitri thinking that she killed her husband and employer for money.

Savitri handovers young Arjun to Dashrath Singh and settles herself as Raj Kumars mother to protect him.Later Arjun (Amitabh Bachchan) grows up to be a naive youngster under the care of Dashrath Singh. He moves to the city to build his life on his own and joins as a bellboy in a five star restaurent. There he meets Poonam (Smita Patil) and they both fall in love. That hotel was owned by Raja Kumar (Shashi Kapoor) and run by Savitri.

Hotel manager Ranjit Singh (Ranjeet) was the son of Girdhar Singh and plans to kill Raja. They manage to show Savitri as a culprit and Raja believes that and suspects Savitri.Gradually Arjun comes to know that Savitri was actually his, not Rajas mother and swears that he would protect Raja at any rate, just like his father did. Meanwhile Raja meets a beautiful young dancer Nisha (Parveen Babi) and gets attracted to her. She was actually hired by Ranjit Singh to kill Raja.

But Nisha falls in love with Raja and couldnt kill him. Finally she arranges a party on a boat to execute her plan but Arjun fails it.Finally goons kidnap Arjuns and Rajas family members and blackmail them to transfer all his property to Ranjits name. Arjun and Raja beat all bad guys and save their loved ones. Raja marries Nisha and Arjun marries Poonam at the end and they reconcile with their mother Savitri.