Doctor Who: The Newbies Guide
The King's Demons
This is the sixth story in Season 20.
The Fifth Doctor is physically younger than his previous incarnations. He wears Edwardian cricketing clothes with a stick of celery on the lapel. He is less eccentric than his previous incarnations. In Earthshock he was unable to save his companion Adric from dying.
Tegan Jovanka is an Australian air stewardess who accidentally stumbled into the TARDIS in Logopolis. She has a tendency to moan. In Time-Flight she was left behind in her native time, but in Arc of Infinity she happened to run into the Doctor and rejoined him on his travels.
Vislor Turlough is an alien who was exiled to Earth. He was posing as a schoolboy at Brendon School. In Mawdryn Undead he made a deal with the Black Guardian to kill the Doctor in exchange for returning home. He did not manage to do so during that story but did stow away on the TARDIS and then ask the Doctor to allow him to join him on his travels. In Enlightenment he cancelled the deal.
Recurring and Historical Characters
The Master is a Time Lord and an enemy and rival of the Doctor. In Terror of the Autons he arrived on Earth and allied with the Nestene Consciousness to attempt to conquer Earth. He was stopped by the Doctor and UNIT. He has since come into conflict with the Doctor on many occasions. In The Keeper of Traken he was reduced to a deathly husk, and then possessed the body of Tremas of Traken. In Logopolis he unleashed a wave of entropy that destroyed a large portion of the universe, including Traken. His actions were also responsible for the Doctor's most recent regeneration.
John is King of England. He succeeded his brother Richard the Lionheart as King of England. In 1215 he signed a document known as the Magna Carta, guaranteeing his Barons certain rights. The document would later be seen as a cornerstone of the English/British constitution.