As part of their experiments in time travel, Drs. Reeves and Takada construct a cyborg "Mandroid" with the body of a downed pilot. After the success of the initial experiments, Reeves decides to have the Mandroid scrapped. Not wishing to be taken apart, Mandroid flees with the help of Dr. Takeda, who is killed for his disobedience. Distraught by the death of his one friend, the Mandroid goes north to America in search of someone who can help him in getting revenge and stopping Dr. Reeves in whatever evil plan he intends to use his time machine for.