Hierro is a Spanish-French mystery drama television series, created by Pepe Coira. It was produced by Movistar+, ARTE France, Portocabo and Atlantique Productions. The first season was released on Movistar+ on 7 June 2019. In September 2019, the series was renewed for a second season, and on 21 January 2021 a trailer was released. Bringing a closure to the series, the second season aired from 19 February to 19 March 2021.