A crook steals a bike from a time-traveler that has come from the year 1992, forty years in the future. He robs a bank and pedals into the future but is recognized anyway and shot as he attempts to flee. His body is deposited back in 1952, minus the bike.
An elderly couple that run an inn in Europe murder their guests in order to rob them and send the money to their son in America. They do not recognize their final victim as their son, who has come home for a surprise visit.
A Martian sleeper agent is eradicated when his usefulness is ended due to incarceration in an asylum. He was committed because he had tried to obtain a passport and could provide no official documentation that he existed.