A band of mercenaries steals Attila the Hun's fabled sword and inadvertently awakens the most feared creature in all of mythology - Cerberus, the monstrous three-headed dog with a thirst for blood.

In Bucharest, Romania, the priceless breastplate of Attila, the Hun is robbed from the National Museum of Antiquities by a gang leaded by the despicable Marcus Cutter, and the curator Radu is killed by one of the thieves. Meanwhile, in New York City, the former assistant of Professor Radu, Dr. Samantha Gaines, is waiting for the valuable piece for an exhibition. The agent Jake Adams visits Samantha in the museum to tell about the heist and the death of her friend, and she tells about the legend that the breastplate would have the inscription of the location of the Sword of Mars, which is guarded by Cerberus and made Attila invincible. When Samantha's brother and addicted gambler Jack is kidnapped, she believes his debt of US$ 2,000.00 could be the reason, and travels to Romania invited by the evil kidnapper Kul Jae Sung, getting involved in a supernatural adventure with Jake.—Claudio Carvalho, Rio de Janeiro, Brazil