Killers from Space

Killers from Space is a independently made 1954 American blackandwhite science fiction feature film, produced and directed by W. Lee Wilder brother of Billy Wilder from an original, commissioned screenplay by his son Myles Wilder and their regular collaborator William Raynor. Killers from Space stars Peter Graves, Barbara Bestar, Frank Gerstle, James Seay, and Steve Pendleton.

Dr. Douglas Martin is a nuclear scientist working on atomic bomb tests. While collecting aerial data on an Air Force atomic blast at Soledad Flats, he loses control of his airplane and crashes. He survives, unhurt, walking back to the air base with no memory of what happened. On his chest is a strange scar that wasnt there before the crash.At the base hospital, Martin acts so strangely that the Air Force brings in the FBI to investigate, thinking he might be an impostor. He is eventually cleared but told to take some time off. He protests being excluded from his project while on leave. ........

Source: Wikipedia