In this sci-fi thriller, John Soames (Terence Stamp) -- a man locked, since birth, in a 30-year coma -- has a groundbreaking cure when Dr. Bergen (Robert Vaughn) gives him a brain transplant. The problem is that the brain comes from a baby, and when Soames comes back to the waking world, he assumes the mental state of a young child. The journey, documented by a television crew, backfires when Dr. Bergan attempts to speed up his rate of maturation, resulting in an explosive climax.