The much-loved first season will go off air next week.
"To all our #Naagin viewers, Season 2 will be back this October. Stay tuned to @ColorsTV," tweeted Colors CEO Raj Nayak along with the link to the new season's trailer.
The promo features Mouni and a new entrant, whose identity hasn't been revealed yet.
The Balaji Telefilms-produced finite series, which premiered in November last year, also starred Adaa Khan in the lead role.