AllMovie

The Doctor (Jon Pertwee) assists U.N.I.T. in its efforts to find out why the Mars Probe 7 project has suddenly cut of all radio contact with earth. The mystery deepens when one of the astronauts successfully returns from Mars, only to begin behaving like a lunatic. Written by Don Houghton and debuting March 21, 1970, the seven-episode "The Ambassadors of Death" was the second Doctor Who adventure to be lensed in color. Unfortunately, only black-and-white prints exist for episodes two through seven.