Looks like I am missing the 7th doctor.
So this is the list of classic Doctor Who episodes, I currently have:
Season 1
0. An Unearthly Child [Pilot]
1. An Unearthly Child
2. The Cave of Skulls
3. The Forest of Fear
4. The Firemaker
5. The Dead Planet
6. The Survivors
7. The Escape
8. The Ambush
9. The Expedition
10. The Ordeal
11. The Rescue
12. The Edge of Destruction
13. The Brink of Disaster
Season 5
1. The Tomb of the Cybermen - Part One
2. The Tomb of the Cybermen - Part Two
3. The Tomb of the Cybermen - Part Three
4. The Tomb of the Cybermen - Part Four
Season 6
23. The Seeds of Death - Part One
24. The Seeds of Death - Part Two
25. The Seeds of Death - Part Three
26. The Seeds of Death - Part Four
27. The Seeds of Death - Part Five
28. The Seeds of Death - Part Six
Season 10
1. The Three Doctors - Part One
2. The Three Doctors - Part Two
3. The Three Doctors - Part Three
4. The Three Doctors - Part Four
5. Carnival of Monsters - Part One
6. Carnival of Monsters - Part Two
7. Carnival of Monsters - Part Three
8. Carnival of Monsters - Part Four
Season 11
1. The Time Warrior - Part One
2. The Time Warrior - Part Two
3. The Time Warrior - Part Three
4. The Time Warrior - Part Four
Season 12
9. The Sontaran Experiment - Part One
10. The Sontaran Experiment - Part Two
Season 14
17. The Robots of Death - Part One
18. The Robots of Death - Part Two
19. The Robots of Death - Part Three
20. The Robots of Death - Part Four
21. The Talons of Weng-Chiang - Part One
22. The Talons of Weng-Chiang - Part Two
23. The Talons of Weng-Chiang - Part Three
24. The Talons of Weng-Chiang - Part Four
25. The Talons of Weng-Chiang - Part Five
26. The Talons of Weng-Chiang - Part Six
Season 16
21. The Invasion of Time - Part One
22. The Invasion of Time - Part Two
23. The Invasion of Time - Part Three
24. The Invasion of Time - Part Four
25. The Invasion of Time - Part Five
26. The Invasion of Time - Part Six
Season 21
11. Resurrection of the Daleks - Part One
12. Resurrection of the Daleks - Part Two
17. The Caves of Androzani - Part One
18. The Caves of Androzani - Part Two
19. The Caves of Androzani - Part Three
20. The Caves of Androzani - Part Four
Season 22
7. The Two Doctors - Part One
8. The Two Doctors - Part Two
9. The Two Doctors - Part Three
With my next order I will at least get one set with the seventh doctor.