Mrs. Morris, at first, thinks nothing of her daughter and a friend playing their game of "invasion". But when Mink starts telling of a Martian named Drill, who is the fore-runner of a Martian invasion of Earth, and Mary discovers that kids of her friends in other parts of the country are playing the same game, she wonders if this is for real.; David Todd and Lynn Ardsley plot her husband's murder, while David and Lawrence are on a mission to Mars to investigate the planet's landscape and possible life forms. The crime is committed, but with unexpected consequences for David!