Dharma Yuddam (transl. War for honour) is a 1979 Indian Tamil-language action film directed by R. C. Sakthi. It stars Rajinikanth and Sridevi. The film was released on 29 June 1979.^[1]

Vijay's parents are killed by Robert. He is adopted and brought up by Thiyagarajan. He comes to love Thiyagarajan's daughter as his own sister. He becomes a successful, soft-spoken, kind yet reclusive business man and is sought by Chitra for an interview. They fall in love while Manju, his sister, falls in love with a photographer. Though initially against the match, Vijay realizes that his sister's lover is hardworking, sincere and is not after money. All seems to go well until one day when Manju is found dead and her eyes missing.

Robert, their family friend, is an illegal organ trader and sells custom requested eyes. He is the one who has kidnapped and killed Manju. Unknown to Robert, Chitra or anyone, Vijay has a weakness. On full moon night, he has an alter-ego that takes over which is extremely violent, overtly strong and incredibly dangerous as it was the day he lost his biological family. His adoptive father and later, his sister chain him up in a room to ensure he does not hurt others and more importantly himself. When Vijay finds out that Robert has been stealing eyes and is responsible for all the deaths, he goes after him but is overpowered by Robert's henchmen. While Robert attempts to find buyer for his eyes, not wanting to waste Vijay's death, full moon rises and Vijay, in his alter-ego, kills every single one of them in rage. He is acquitted both on account of his condition and that the dead are criminals.

The soundtrack was composed by Ilaiyaraaja.^[3][4] The song, "Oru Thanga Radhathil" is set in Mohanam raga and "Aagaya Gangai" is set in Madhyamavati.^[5][6]

Daniel, a consulting psychiatrist, criticised the lead character's condition, that he becomes invincible and violent on a full moon night, as a medically inaccurate myth, noting its similarities to werewolf theories.^[7]