After stealing Attila the Hun's breastplate, a group of ruthless treasure hunters led by vile Marcus Cutter (Greg Evigan) uses it to find the Hun's sought-after sword, which is believed to make its owner invincible. But when they lift the fabled weapon from its final resting place, they awaken Cerberus, a mythical three-headed dog whose only job is to keep it from them. Emmanuelle Vaugier plays a brainy archaeologist in this made-for-TV tale.