Who?

Who? (1974) is a mystery, thriller, science fiction directed by Jack Gold rated 5.0/10.

After an American scientist is severely injured and scarred in a car crash along the border with East Germany, he is captured by East German military. The scientists use metal implants to save him. Once he's back in the States, no one can tell if it's really him, so an intelligence specialist must determine who is under the "mask".