Guest poster VinNay here. Ms. Summers requested a list of old Doctor Who episodes to watch, so here it is. This list assumes you have watched all of the new series (9th-11th Doctors). If not, go watch them already, and come back in a few weeks.
The Massacre of St Bartholomew's Eve (4 episodes) -
Location: Paris, France. 1572.
Plot: Tensions between Protestants and Catholics.
Companions: Steven Taylor and Dodo Chaplet (her first appearance).
Historical Figures: King Charles IX of France, and Catherine de' Medici
Notes: This is only available as audio, and it is one of three Dr Who serials where all video has been lost. If you find a copy, BBC will pay you handsomely, and private collectors will pay you even more handsomely.
The Mind Robber (5 episodes)
Location: The Void, a realm outside of space and time.
Plot: Fantasy land weirdness.
Companions: Jamie McCrimmin and Zoe Heriot
Notes: The character called the Master in this episode in NOT the same character as the renegade Time Lord of the same name.
Inferno (7 episodes) -
Location: Earth. 1970. Parallel Earth. 1970
Plot: In a parallel universe, Great Britain is under a fascist regime.
Companions: Liz Shaw. The Brigadier General (U.N.I.T.)
Notes: Last appearance of the original TARDIS console.
The Time Warrior (4 episodes)
Location: Earth, 1974. Earth, Middle Ages.
Plot: Bandits in the Middle Ages find a crashed Spaceship.
Companions: The Brigadier General, Sarah Jane Smith
Notes: First appearance of both Sarah Jane Smith and the Sontarans. First mention of Gallifrey.
The Ark in Space (4 episodes) -
Location: Space Station Orbiting Earth. ~35th Century.
Plot: Suspended Animation. Insect creatures. Cataclysm on Earth.
Companions: Sarah Jane Smith. Harry Sullivan.
Notes: Connects to 11th Doctor episode The Beast Below.
Genesis of the Daleks (6 episodes) -
Location: Gallifrey, Skaro (Dalek homeworld)
Plot: Beginning of the Time War. Time Lords send the Doctor to stop the Daleks from ever existing.
Companions: Sarah Jane Smith. Harry Sullivan.
Notes: Meet Davros.
The Hand of Fear (4 episodes)
Location: Earth, 1976, Earth, 150 million years ago.
Plot: Sarah Jane finds a fossilized hand that is 150 million years old.
Companions: Sarah Jane Smith
Notes: Last appearance of Sarah Jane as 4th doctors companion, sort of.
The Deadly Assasin (4 episodes) -
Plot: President of the High Council is assassinated. The Doctor is the prime suspect.
Notes: Set between Sarah Jane's departure and Leela joining the next story. The only story of the classic series to feature the Doctor without a companion.
The Robots of Death (4 episodes) -
Location: Remote Desert on a distant planet.
Plot: Crew of Miners start getting murdered.
Notes: Referenced by the 2007 Christmas special Voyage of the Damned.
The Talons of Weng-Chiang (6 episodes) -
Location: London, 1890's.
Plot: A fiendish plot involving Chinese tongs, disappearing women, an Oriental stage magician, a murderous ventriloquist's dummy and giant rats in the sewers.
Notes: Great episode, but beware of racial stereotyping.
Season 16 aka The Key To Time (26 episodes) -
Plot: The Doctor must recover the pieces of the Key to Time.
Companions: Romana I, K-9 Mk-2
Notes: Just watch the whole season.
City of Death (4 episodes) -
Location: Paris, France. 1979.
Plot: Mona Lisa is Stolen.
Companions: Romana II
Notes: Romana is the Doctors snarky Time Lord Companion. Some people think River Song might be a regenerated Romana. I'm not one of those people. Written by Douglas Adams.
Earthshock (4 episodes)
Location: Earth. Some time in the future.
Plot: An investigation into the murder of a team of scientists in a complex of caves. Deadly androids are patrolling the tunnels, but what are they protecting... and for whom are they working?
Companions: Adric, Nyssa, and Tegan.
Notes: Last story to feature Adric.
The Caves of Androzani (4 episodes)
Location : Androzani Minor.
Plot: The Doctor gets caught in the politics and dangers of mining spectrox, the most valuable substance in the universe.
Companions: Peri Brown
Notes: Best regeneration in Doctor Who history. Also, this satisfies my including the 6th Doctor. There will be no further mention of the 6th Doctor.
Ghostlight (3 episodes) -
Location: London. 1883.
Plot: Doctor takes Ace back in time to visit an evil house.
Notes: First story in the "Ace Trilogy" exploring Ace's troubled past.
The Curse of Fenric (4 episodes) -
Location: Earth. WWII
Plot: The Axis are the least of Earths problems.
Notes: Lots of people hate Ace, but she was the proto-Rose. Second story in the "Ace Trilogy."
The Doctor Who TV Movie, also known as The Enemy Within (1 episode) -
Location: Skaro, TARDIS, San Fran 1999,
Plot: Daleks convict The Master of evil deeds and his remains are given to The Doctor.
Companions: Grace Holloway
Notes: 1996 film attempt to revive the Doctor Who series. The only televised appearance of the 8th Doctor. The most steampunky version of the TARDIS to date.
The Three Doctors (4 episodes) -
Location: Gallifrey, Anti-Matter Universe
Plot: The Doctors (1st, 2nd, and 3rd) must stop Omega from destroying the Universe.
Companions: Jo Grant
Notes: This movie gives some history to the Time Lords and how they became what they are. Some people think River Song is Omega. I am not one of those people.
The Five Doctors (movie)
Plot: Someone is plucking all the incarnations of the Doctor (1-5) out of time and placing them in the Death Zone on Gallifrey, where they will meet old friends and enemies and play out the deadly Game of Rassilon, for the ultimate prize.
Companions: Tegan, Vislor, Sarah Jane, Susan, Brigadier, Romana.
Notes: I'm kinda meh on this movie, but others seem to like it.
Some other episodes that may be of interest -
The Tenth Planet - 1st Doctor - 1st appearance of The Cybermen.
The Daleks - 1st Doctor - 1st appearance of The Daleks.
Spearhead From Space - 3rd doctor - 1st appearance of Autons
Doctor Who and the Silurians - 3rd doctor -1st appearance of the Silurians.
The Mark of the Rani - 6th doctor - 1st appearance of The Rani. Some people think River Song is The Rani. I am not one of them.