Fantastic Voyage (1966)

James Brolin, Raquel Welch, Donald Pleasence, Edmond O'Brien

Scientist Jan Benes (Jean Del Val), who knows the secret to keeping soldiers shrunken for an indefinite period, escapes from behind the Iron Curtain with the help of C.I.A. Agent Grant (Stephen Boyd). While being transferred, their motorcade is attacked. Benes strikes his head, causing a blood clot