Regreso del futuro

This Spanish science fiction publication from 1971 presents "Regreso al futuro" (Return from the Future) by Peter Kapra. The issue opens with an extensive introduction examining time travel theory, contrasting H.G. Wells's fictional "Time Machine" with modern scientific approaches. It discusses Einstein's relativity theory, German astronomer Eugene Sänger's 1957 calculations on relativistic time dilation for interstellar travel, and Erich von Däniken's photonic propulsion concepts. The introduction argues that theoretical faster-than-light spacecraft could enable time travel through Lorentz transformations.

The serialized narrative follows Conrad Wienner, sole survivor of the photonic-propelled spacecraft "Blitz-F-2," launched from the Ulm cosmodrome in 2053. After fifty-two years aboard, his fourteen crew members have died from an unexplained disease. Now eighty-six years old, Wienner continues the ship's automatic routines alone, haunted by memories of his family and colleagues, increasingly weakened and fearing he shows symptoms of the fatal illness that claimed his companions. The OCR becomes fragmentary near the conclusion.