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Locked Up is a Spanish crime drama television series co-created by Álex Pina, Iván Escobar, and Esther Martínez Lobato, and produced by Globomedia. Featuring an ensemble cast, the story focuses on the high-stakes lives of characters in and out of prison, and is primarily led by Macarena Ferreiro, who is imprisoned for financial crimes, and Zulema Zahir, a violent career criminal. The series premiered on 20 April 2015 on Spanish channel Antena 3. Its first two seasons were broadcast by Antena 3, and its last three seasons by Fox Spain.