The Doctor and Jo discover The Master and the Ogrons are the masterminds behind the Galactic war between the Earth Federation and the Reptillian Draconian Empire and the Master has framed The Doctor and Jo as spies working for the Draconians. Only to discover The Master is also working with the Doctor's greatest enemies, The Daleks, who are also behind the galactic war.
Did You Know?
The futuristic "blasters" used by human personnel in this serial (and by the Master, when impersonating a human officer) appear to be slightly modified replicas of the Mauser C96 "Broomhandle" pistol, with additional attachments to the barrel and sights. Three-four years later, almost the same design would be used to construct Han Solo's blaster pistol in Star Wars: Episode IV - A New Hope
(1977). See more
[as the Doctor is telling about when he was exiled to Earth
In reminescent mood, are you, Doctor? Poor Miss Grant, you have my deepest sympathy.
Referenced in The Space War