Enemy Unseen (1989)

Two young scientists, Mel Noble and Roxeanne Tangent, journey to a remote African island to study crocodiles. Their expedition turns dangerous when local people attack their camp and kidnap Roxeanne. Her father, Gordon, hires Steiger and his team of investigators to find the kidnappers, who are natives who revere crocodiles as sacred. The challenge: these natives are invisible. As Steiger and his crew navigate the jungle and waterways teeming with crocodiles, they must fight for survival and rescue Roxeanne from a horrific ritual sacrifice performed by an unseen enemy.