Kali is one of the goddesses who live and rule in the celestial city. Before she became Kali she was known as Murga. She is a deceitful person who shares with Yama the ability to kill with her gaze. She is not above using sexual favors to get her way with the other gods.
Kali marries Yama the deathgod in a grand ceremony int he celestial city. In honor of the event, she calls for a human sacrifice and has Sam executed by one of the white tigers that roam the forest outside the city. Although it is never explicitly mentioned, it is suggested that the cat that kills Sam is actually Kali herself in animal form.
After Sam kills the god Brahma, Kali is asked to assume the role of the chief god. She accepts, even though it means taking a male form and ending her marriage to Yama. This ultimately drives Yama to oppose her, but after the gods have been weakened considerably and Sam offer Brahma the choice to join him, she becomes allies with Sam and Yama again. She is badly wounded by Nirriti in the final battle and is carried off by Yama, who transfers her soul into the body of a young girl. Something called "transfer effect" renders her brain-damaged, however. Yama raises her with the help of Kubera and Ratri and then leaves her in their care.