Mandrake.

An expedition led by adventurer Darren McCall and funded by the wealthy Harry Vargas braves the impenetrable jungle to retrieve a fabled bejeweled dagger from an ancient burial ground. But pulling the dagger from its rightful resting place awakens the long-dormant plant creature - part plant, part animal, and all bloodthirsty -- and sends it on a feeding frenzy from which there seems scant hope of survival or escape...