Caltiki – The Immortal Monster is a 1959 black-and-white science fiction-horror film with similarities to The Blob that was released in the previous year. 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.

The Blob is a 1958 American independent science fiction horror film directed by Irvin Yeaworth and written by Kay Linaker and Theodore Simonson. It stars Steve McQueen and Aneta Corsaut and co-stars Earl Rowe and Olin Howland. It was distributed by Paramount Pictures as a double feature with I Married a Monster from Outer Space.