This is a story about Ahmed and Mohan, who act as mock witnesses and always hang around court to give evidence as per the requirement of a case. This changes when they meet and are influenced by Kabir Das, and decide to go straight. But they soon feel that it's virtually impossible to earn a living as honest citizens. Meanwhile, Kabir Das is arrested for a murder he claims he did not commit, and the duo promise to help him, and find out who the real killer is, but they end up getting in trouble themselves.

• Amitabh Bachchan - Ahmed Raza
• Shashi Kapoor - Mohan Saxena
• Sanjeev Kumar - Kabir Das
• Rekha - Durga
• Aparna Sen - Shyamlee
• Helen - Jenny Francis
• Amrish Puri - Dharam Dayal
• Prem Chopra - Ranjeet
• Dr. Shreeram Lagoo - Govinda Anna
• A. K. Hangal - Masterji, Shyamlee's Father
• Om Shivpuri - Seth Jamuna Das
• Utpal Dutt - Balbir Singh, Military Man
• M. B. Shetty - Kargah
• Sudhir - Gupta
• C.S. Dubey - Lawyer, Gullu Miya's Case
• Satyan Kappoo - Prosecuting Lawyer, Jamuna Das' Case
• Pinchoo Kapoor - Kabir's lawyer
• Sajjan - Lawyer, Jenny's Case
• Raj Kishore - Munshi
• Macmohan - False witness
• Baby Rani - Pinky Francis
• Jagdish Raj - Police Inspector
• Gajanan Jagirdar - Barkat Chacha

• Director - Desh Mukherjee
• Writer - Salim-Javed
• Producer - J. N. Manchanda, Premji
• Production Company - Suchitra Films Pvt. Ltd.
• Editor - Das Dhaimade
• Cinematographer - Nariman A. Irani
• Art Director - Marutirao V. Kale
• Stunts - Kodi S. Irani, M. B. Shetty
• Costume and Wardrobe - Dhanji Mistry, Keshav Rao
• Choreographer - P. L. Raj
• Music Director - Laxmikant-Pyarelal
• Lyricist - Anand Bakshi
• Playback Singers - Mohammed Rafi, Asha Bhosle, Mahendra Kapoor, Kishore Kumar, Lata Mangeshkar, Mukesh.