The Fourth Doctor was portrayed by Tom Baker from 1974-1981.

Season Twelve (1974-1975)

• Robot
• The Ark in Space
• The Sontaran Experiment
• Genesis of the Daleks
• Revenge of the Cybermen

Season Thirteen (1975-1976)

• Terror of the Zygons
• Planet of Evil
• Pyramids of Mars
• The Android Invasion
• The Brain of Morbius
• The Seeds of Doom

Season Fourteen (1976-1977)

• The Masque of Mandragora
• The Hand of Fear
• The Deadly Assassin
• The Face of Evil
• The Robots of Death
• The Talons of Weng-Chiang

Season Fifteen (1977-1978)

• Horror of Fang Rock
• The Invisible Enemy
• Image of the Fendahl
• The Sun Makers
• Underworld
• The Invasion of Time

Season Sixteen (1978-1979)

• The Ribos Operation
• The Pirate Planet
• The Stones of Blood
• The Androids of Tara
• The Power of Kroll
• The Armageddon Factor

Season Seventeen (1979-1980)

• Destiny of the Daleks
• City of Death
• The Creature from the Pit
• Nightmare of Eden
• The Horns of Nimon
• Shada

Season Eighteen (1980-1981)

• The Leisure Hive
• Meglos
• Full Circle
• State of Decay
• Warriors’ Gate
• The Keeper of Traken
• Logopolis

Source of inspiration and material: Wikipedia & BBC