An old friend of Tann’s, Caroline Watson has discovered the Primal Stone of the Soul and is being stalked by De La Porta and his men. Tann, Jason, Kong, and Lua fly to Guatemala to rescue her. In an ancient Mayan temple the Professor captures Tann and Caroline and uses the Stone to size control of their minds. Jason merges with Kong and battles a giant mutant Jaguar. Defeating the Cyber creature they free their friends and recover the Stone.