Lalkar (Challenge) is a 1972 Indian Hindi-language war action film produced and directed by Ramanand Sagar. It was adapted from a Hindi novel Sagar had written, called "Lalkar". The film had music composed by Kalyanji Anandji and the lyricists were Hasrat Jaipuri, Indeevar, Mahendra Dehlvi and Kulwant Jani. It was rated as a hit and cited as one of the "highest grossers" of 1972. Stated to be the costliest war film produced at the time, it starred Dharmendra, Rajendra Kumar, Mala Sinha and Kum Kum in lead roles. The rest of the cast included Nazir Hussain, Sujit Kumar, Ramesh Deo, Dara Singh and Agha.