Naaginn - Litmus Test) is a Hindi television series that aired on Zee TV from 5 October 2007 till 11 April 2009.

[1] The show is based on a tale of an ichchhadhari naagin (a female shape-shifting cobra) named Amrita.

She transforms herself into a woman to take revenge from the Singh family, which had killed her parents (king and queen of Naaglok) to get the valuable naagmani (cobra gem).

While dying, the queen instructs Amrita to take revenge from the killers and get back the naagmani to revive her parents.

Triveni goes to the sorcerer Bhairavnath who helps her in trying to bring Amrita to the human world so she can be finished off forever.