Professor who takes over Ángela's thesis supervision. Questions her about the missing tape and Figueroa's death. Later confronts Ángela and Chema in a hidden tunnel, confessing to editing snuff videos but denying involvement in the murders. Attempts to execute Ángela but is killed by Chema.
Castro initially occupies the institutional role of Ángela's academic supervisor.
Castro takes over supervision of Ángela's thesis and questions her about Figueroa's death and the missing tape.
Chema stops Castro's execution attempt.
Chema appears while Castro aims a gun at Ángela and wrestles with him, causing the gun to go off and kill Castro.
Castro replaces Figueroa as Ángela's academic supervisor.
After Figueroa dies, Castro takes over supervision of Ángela's thesis.
Castro is implicated in the production of the recording of Vanessa's murder.
Castro tells Ángela that he edited the snuff videos but did not murder anyone, while Vanessa's torture and death appear in one of those videos.
Castro led the earlier workshop attended by the other characters.
Yolanda says that she, Vanessa, Bosco, and Chema attended a series of director's workshops with Castro.
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