Tuk kae phii

While studying caves, a group of geologists leaded by Professor Maeda is attacked by gecko fiends that possess their bodies transforming them into zombies. The next morning, the local inspector finds the corpses of the team. Miss Kwan travels to that location to give lectures and is possessed by the evil gecko spirit, but her skeptical boyfriend doctor does not understand what is happening to her and believes she has suffered brain damage. (imdb)