Doctor Who (Original Series) Fourth Doctor 7 Series 42 Serials 178 Episodes Rated: PG
The Fourth Doctor was portrayed by Tom Baker. He is, to date, the actor who has played the Doctor on television for the longest period of time, having held the role for seven seasons.

The Ribos Operation
	1	The Ribos Operation (Part 1)
	2	The Ribos Operation (Part 2)
	3	The Ribos Operation (Part 3)
	4	The Ribos Operation (Part 4)
The Pirate Planet
	5	The Pirate Planet (Part 1)
	6	The Pirate Planet (Part 2)
	7	The Pirate Planet (Part 3)
	8	The Pirate Planet (Part 4)
The Stones of Blood
	9	The Stones of Blood (Part 1)
	10	The Stones of Blood (Part 2)
	11	The Stones of Blood (Part 3)
	12	The Stones of Blood (Part 4)
The Androids of Tara
	13	The Androids of Tara (Part 1)
	14	The Androids of Tara (Part 2)
	15	The Androids of Tara (Part 3)
	16	The Androids of Tara (Part 4)
The Power of Kroll
	17	The Power of Kroll (Part 1)
	18	The Power of Kroll (Part 2)
	19	The Power of Kroll (Part 3)
	20	The Power of Kroll (Part 4)
The Armageddon Factor
	21	The Armageddon Factor (Part 1)
	22	The Armageddon Factor (Part 2)
	23	The Armageddon Factor (Part 3)
	24	The Armageddon Factor (Part 4)
	25	The Armageddon Factor (Part 5)
	26	The Armageddon Factor (Part 6)