A warrior from the 16th Century, the first female university student from the 19th Century, and a paramedic from the 21st Century join a secret agency to prevent people from changing Spanish history using time-traveling doors.

Three people from different centuries are recruited by a mysterious organization whose purpose is to make sure that the history of Spain proceeds as it should. A 16th-century soldier, a 19th-century university student, and a 21st-century paramedic each bring indispensable talents and a shared courage that bind them into a formidable team.