Hawkeye tangles with a tough Army colonel, Colonel Spiker, B.J. helps Zale, who's received a "Dear John" letter, and Frank looks endlessly for Korean saboteurs.

England, the near future... perhaps. The TARDIS lands in the woods near Devesham Space Centre, and mysteries abound: soldiers rise from the grave, men lost in deep space are alive and well, and the entire population behaves very oddly indeed. What has happened to Earth - or is the true threat yet to come?