First Doctor/Appearances

The following is a comprehensive but not definitive list of the First Doctor's appearances.

Season 1

 * The Pilot Episode (non-canonical; introduction)
 * An Unearthly Child (introduction)
 * The Daleks
 * The Edge of Destruction
 * Marco Polo
 * The Keys of Marinus
 * The Aztecs
 * The Sensorites
 * The Reign of Terror

Season 2

 * Planet of Giants
 * The Dalek Invasion of Earth
 * The Rescue
 * The Romans
 * The Web Planet
 * The Crusade
 * The Space Museum
 * The Chase
 * The Time Meddler

Season 3

 * Galaxy 4
 * The Myth Makers
 * The Daleks' Master Plan
 * The Massacre of St Bartholomew's Eve
 * The Ark
 * The Celestial Toymaker (largely absent)
 * The Gunfighters
 * The Savages
 * The War Machines

Season 4

 * The Smugglers
 * The Tenth Planet (largely absent; regenerates)
 * The Power of the Daleks (cameo)

Season 9

 * Day of the Daleks (flashback; archival photo)

Season 10

 * The Three Doctors (extended cameo)

Season 13

 * The Brain of Morbius (flashback: archival photo)

Season 19

 * Earthshock (flashback; archival material)

Season 20

 * Mawdryn Undead (flashback; archival footage)
 * The Five Doctors (also, archival material)

Season 21

 * Resurrection of the Daleks (flashback; archival material)

Doctor Who Mini-episode

 * Dimensions in Time (cameo; not played by live actor; not regarded as canon)

Virgin New Adventures

 * Timewyrm: Revelation (ghost/mental projection)
 * Nightshade (flashback)
 * All-Consuming Fire (cameo)
 * Lungbarrow (flashback)

Virgin Missing Adventures

 * Venusian Lullaby
 * The Sorcerer's Apprentice
 * The Empire of Glass
 * The Man in the Velvet Mask
 * The Plotters

BBC Eighth Doctor Adventures

 * The Eight Doctors (cameo)

BBC Past Doctor Adventures

 * The Witch Hunters
 * Salvation
 * City at World's End
 * Divided Loyalties (cameo; flashback)
 * Bunker Soldiers
 * Byzantium!
 * Ten Little Aliens
 * The Eleventh Tiger
 * The Time Travellers

Telos Doctor Who Novellas

 * Time and Relative
 * Frayed

Doctor Who Annuals

 * The Sons of the Crab
 * The Lost Ones
 * The Monsters from Earth
 * The Lair of Zarbi Supremo
 * Peril in Mechanistria
 * The Fishmen of Kandalinga
 * The Cloud Exiles
 * The Sons of Grekk
 * Terror on Tiro
 * The Devil-Birds of Corbo
 * The Playthings of Fo
 * Justice of the Glacians
 * Ten Fathom Pirates

Brief Encounters

 * Urrozdinee
 * Echoes of Future Past
 * Who Discovered America?
 * Rennigan's Record
 * Roses
 * Cambridge Previsited
 * The Meeting

Decalog and Short Trips

 * The Exiles
 * Bide-a-Wee
 * The Gift
 * Childhood Living
 * Ash
 * The Ruins of Time
 * The Mother Road
 * The Last Days
 * Nothing at the End of the Lane
 * Mire and Clay
 * The Thief of Sherwood
 * The Duke's Folly
 * The Book of Shadows
 * Set in Stone
 * The Nine-Day Queen
 * The True and Indisputable Facts in the Matter of the Ram's Skull
 * A Long Night
 * Romans Cutaway
 * Every Day
 * Corridors of Power
 * The Schoolboy's Story
 * Planet of the Bunnoids
 * Mars
 * Scribbles in Chalk
 * The Little Drummer Boy
 * Making History
 * Waiting for Jeremy
 * The Glass Princess
 * 64 Carlysle Street
 * The Golden Door
 * Tarnished Image
 * There are Fairies at the Bottom of the Garden
 * The Rag and Bone Man's Story
 * Five Card Draw
 * The Three Paths

TV Comic

 * The Klepton Parasites
 * The Therovian Quest
 * The Hijackers of Thrax
 * On the Web Planet
 * The Gyros Injustice
 * Challenge of the Piper
 * Moon Landing
 * Time in Reverse
 * Lizardworld
 * The Ordeals of Demeter
 * Enter: The Go-Ray
 * Shark Bait
 * A Christmas Story
 * The Didus Expedition
 * Space Station Z-7
 * Plague of the Black Scorpi
 * The Trodos Tyranny
 * The Secret of Gemino
 * The Haunted Planet
 * The Hunters of Zerox
 * The Underwater Robot
 * Return of the Trods
 * The Galaxy Games
 * The Experimenters
 * Prisoners of Gritog
 * Guests of King Neptune
 * The Gaze of the Gorgon
 * Prisoners of the Kleptons
 * The Caterpillar Men
 * Deadly Vessel
 * Kingdom of the Animals

Doctor Who Annual

 * Mission for Duh

Doctor Who Magazine

 * Timeslip (regressed from Fourth Doctor to earlier self)
 * Planet of the Dead (impersonation)
 * Flashback (virtual reality "time travel")
 * Time & Time Again
 * Food for Thought
 * Are You Listening?
 * A Religious Experience
 * Operation Proteus
 * The Final Chapter (flashback; cameo)
 * Happy Deathday (virtual reality?)