Secret Organizational Service (S.O.S.) is an international crime syndicate, quite successful with their feminine agents operating under the guise of a fashion model agency led by Lady Bristol and her associate Luigi. The International Service is the governmental secret service decided to put a term to SOS's action. An agent has infiltrated SOS - but she is in danger, after sending a coded message to her supervising Inspector. So, agents Alex Dinamo is to join forces with Adriana, and give the undercover agent a hand.

Resurrected by his grandson, a diabolical scientist with an unquenchable thirst for blood goes on a rampage. (A revision of the Mexican horror film LA MARCA DEL MUERTE, considerably edited and with 20 minutes of new American-made footage.)