Mera Saathi is a romantic action drama following the story of a dreaded goon Ranga Nath (Jeetendra). Ranga’s life changes when Raagini (Jaya Prada) comes to his life, and completely transforms him, making him a good and honest man. Soon after, the two get married and become parents to a baby girl. However, their life turns upside down when their daughter elopes with a fraudster. Will the two be able to save their daughter? Will Ranga be forced to return to his past life to find his daughter?