After anthropologist Henderson James loses his Megasoid specimen, he has a Duplicate made to hunt it down and kill it. No identification or money was given to him, only a single energy pistol to carry out his mission. He was programmed to return to the real Henderson's home at midnoght so he could be killed.
As a precautionary measure a contolled poison was placed in his bloodstream. it was designed to take effect five hours after the Duplicate's creation(midnight).