Caltiki – The Immortal Monster () is a 1959 black-and-white science fiction-horror film. The film's storyline concerns a team of archaeologists investigating Mayan ruins, who come across a creature that is a shapeless, amorphous blob. They manage to defeat it using fire, while keeping a sample of the creature. Meanwhile, a comet, which previously passed near the Earth around the time of the collapse of the Mayan civilization, is due to return, raising the possibility of a connection between the creature and the comet.