Adam B. Vary Senior Entertainment Writer After nearly two years of production, Amazon Prime Video has finally pulled back the curtain on “Citadel,” the wildly ambitious new spy series starring Richard Madden and Priyanka Chopra Jonas, with the first trailer released Monday. The show is meant to serve as the mothership for several planned spin-offs based in local countries and performed in local languages: “Citadel” series set in Italy and India are already underway, with another Mexico-based show also in the works. It’s a gigantic and expensive bet on an original concept that had remained, up until this month, shrouded in mystery. As Variety previously reported, “Citadel” boasts a $185 million budget.