In the conclusion of the seven-part story "The Ambassadors of Death," disgruntled ex-astronaut General Carrington (John Abineri) has stepped up his scheme to foment a war between the earth and a formerly peaceful planet. To prevent this catastrophe, the Doctor (Jon Pertwee) must find a way to exchange the planet's three kidnapped ambassadors with their human lookalikes. But with six episodes already behind him, the Doctor has only 25 minutes' worth of screen time to save mankind. Written by Don Houghton, "The Ambassadors of Death, Episode 7" originally aired on April 25, 1970. Filmed in color, this episode presently exists in black-and-white only. ~ Hal Erickson, Rovi