Naagin S02 E56 Shivangi's Powers are Back!

"A female shape shifting serpent"

Shivangi is now trapped in jail and in her human form. But when some armed assailants take over the jail, she is forced into a confrontation and discovers something surprising about herself! Her powers are back, and she can suddenly take the form of a Naagin once again! What is the reason behind the return of her powers?