UFO Theater: Killers from Space (1954)

Dr. Douglas Martin (Peter Graves) is a nuclear scientist working on atomic bomb tests. While collecting aerial data on a United States Air Force (USAF) atomic blast at Soledad Flats, he loses control of his aircraft and crashes. He appears to have survived, unhurt, walking back to the air base with no memory of what happened. On his chest is a strange scar that was not there before the crash.