is the third serial of the seventh season of Doctor Who , originally broadcast in seven weekly parts from March 21 to May 2, 1970 . It features Jon Pertwee as the Third Doctor in his first major venture into space during his Earth-bound era. Plot Summary
: Primarily credited to David Whitaker , though the final script was heavily rewritten by Malcolm Hulke , Trevor Ray , and Terrance Dicks . "Doctor Who" The Ambassadors of Death: Episode ...
The story revolves around a mystery at regarding Mars Probe 7 , which has been out of contact for seven months. is the third serial of the seventh season