The Amazing Colossal Man (also known as The Colossal Man) is a 1957 American black-and-white science fiction film from American International Pictures. Produced and directed by Bert I. Gordon, it stars Glenn Langan, Cathy Downs, William Hudson, and Larry Thor. It is an uncredited adaptation of Homer Eon Flint's 1928 short science fiction novel The Nth Man. AIP theatrically released it as a double feature with Cat Girl.

Plot

At a military site in Desert Rock, Nevada, a test explosion of the first atomic plutonium bomb does not detonate as expected. When an unidentified civilian aircraft crash lands near the site, Lt. Colonel Glenn Manning runs into the detonation area to rescue the pilot. Once in the detonation area, the bomb goes off, and Glenn gets caught in the radioactive blast.