Leo San Juan, the ongoing hero of the Leyendas films, makes his way to Puebla and is mistaken for a rebel soldier by royalist forces and imprisoned in an old convent. When a hideous monster begins to terrorize guards and prisoners alike, chaos ensues and Leo must find his way out of the prison before the royalists dynamite the convent In the end, though, Leo discovers that the monster is not at all what it seems.

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