Alpha

Following the 1999 Kargil War, Colonel Fateh Singh Lakhawat, with the assistance of Lieutenant Colonel Vikrant Kaul, initiates a covert Indian Army super-soldier project known as Alpha. Three years later, after successful trials, the program receives official approval. Meanwhile, Vikrant's pregnant wife, Janaki, is diagnosed with congenital heart disease. Hoping to save her and her unborn child's lives, Vikrant secretly steals a vial of the experimental Alpha serum, which possesses regenerative properties, and administers it to her. Although her condition improves during the later stages of pregnancy, the serum's long-term effects prove fatal. Janaki dies shortly after giving birth to twin daughters. As a consequence of Vikrant's actions, and the death of some soldiers after the trials due to brain hemorrhage, the Alpha program is ordered to be discontinued, Vikrant retires from the army, and Fateh is demoted to Lieutenant Colonel and reassigned to Cherrapunji.

Determined to continue the project, Fateh, aided by Dr. John Verghese, abducts one of the newborn twins, who has inherited the serum in her bloodstream, while deceiving Vikrant into believing that both his wife and daughter died. Naming the child Sita in memory of Janaki, Fateh raises her at a secret facility in Rajasthan as the primary subject of a revived Alpha program. The second twin, Durga, is raised separately and grows up unaware of her sister's existence.

Twenty-four years later, in 2026, Sita systematically assassinates the scientists and military officials associated with the Alpha program before destroying Fateh's research facility. Her actions attract the attention of the Research & Analysis Wing (R&AW), led by Vikrant, who has succeeded his late friend Sunil Luthra as the agency's chief. After confronting Fateh, Vikrant learns that Sita is his biological daughter. He subsequently travels to Valladolid to meet Durga, who has been living an ordinary life.

Sita tracks Vikrant to his safe house in Srinagar, where she briefly fights Durga before subduing the pair and revealing that she has learned the truth about Project Alpha from Verghese. Before they can reconcile, Fateh's forces attack the safe house. Sita and Durga escape to another safe house in Ladakh, while Vikrant remains behind to delay the attackers and pursue Fateh. Although Vikrant locates him, he is captured.

Fateh's forces later assault the Ladakh safe house but are repelled with the assistance of Kabir Dhaliwal. During the battle, Durga is wounded, allowing Sita to escape with her while Kabir covers their retreat. Sita later infiltrates Fateh's compound in Srinagar alone and discovers Vikrant with an explosive device strapped to his body. Fateh reveals that his true identity is Major Zarrar Khan, an undercover operative of the Inter-Services Intelligence (ISI) who infiltrated the Indian Army in 1989 with the objective of developing the Alpha serum and delivering it to Pakistan. Zarrar subsequently departs for his base in Cherrapunji after abducting Durga to harvest her brain cells in the development of an improved version of the serum.

After escaping, Sita and Vikrant track Zarrar to his Cherrapunji facility. Durga frees herself and joins Vikrant and the soldiers stationed at the base in resisting Zarrar's forces. During the ensuing confrontation, Sita defeats Zarrar and pins him on a wall. Learning that there will be complications keeping him alive, Kaul asks Sita to kill him by shooting him in the head. With the Alpha program dismantled and Zarrar killed, Vikrant is reunited with both of his daughters. He offers Sita and Durga the choice of leading ordinary lives or joining R&AW to use their abilities in service of India.