World Without End (also known as Flight to the Future) is a 1956 American science fiction film directed by Edward Bernds and starring Hugh Marlowe and Nancy Gates.

The film was distributed on a double feature with the Lon Chaney Jr. film Indestructible Man.In March 1957, commander Dr. Eldon Galbraithe, engineer Henry Jaffe, radioman Herbert Ellis and scientist John Borden, are returning to Earth from the first spaceflight, a reconnaissance trip around Mars.

They theorize, from seeing time-worn gravestones and after their ship's instruments register heightened residual radiation, that a devastating atomic war had broken out in 2188, and that they are at least 200 years past that date.

(However, the background radiation has decreased to tolerable levels, and the men later learn that normal humans are often born to the mutates.

Seeking shelter from the attacking mutates in a cave, the four men discover the entrance to an underground city, whose residents are the descendants of those who fled there from the atomic war.

When Timmek's daughter Garnet shows she is attracted to John Borden, Mories, an already hostile member of the council, becomes jealous.

Finding the weapons, Timmek orders the astronauts expelled, but Deena testifies that she saw Mories hide the guns.

He studied Albert Einstein's theory of relativity to give his space and time travellers a plausible way to go into the future.

[1] World Without End was partly made in order to reuse footage and costumes from the earlier Allied Artists science fiction film Flight to Mars (1951).

[5] The plot of World Without End was later repeated in other films, The Mole People (1956), The Time Travelers (1964), and Planet of the Apes (1968).