Beneath the Planet of the Apes

A new ship from across space and time lands under the command of astronaut Brent, who is searching for the missing George Taylor. He once again encounters the apes that rule the world, reducing humans to slavery. However, with the help of Dr. Zira, he follows Taylor's trail to the Forbidden Zone, where, in the catacombs of what is left of the New York subway, he finds a mutant human race with telepathic powers.