Caltiki - The Immortal Monster is a 1959 Italian science fiction horror film directed by Riccardo Freda. The plot concerns a team of archaeologists investigating Mayan ruins who come across a blob-like monster. They manage to destroy it with fire while keeping a sample of the monster. Meanwhile, a comet is due to pass close to Earth, the same comet which passed near the Earth at the time the Mayan civilization mysteriously collapsed. The film proposes the question "Is there a connection between the monster and the comet?"
Nominal director Riccardo Freda claims that he abandoned the film so that future director Mario Bava, who he knew would be a good director, had the chance to direct. Bava's first screen credit as director was the 1960 classic Black Sunday.