3 for all except the 6th Doctor
1st - Marco Polo (on audio), The Aztecs, The Romans
2nd - The Highlanders (audio), The Web Of Fear (audio), The War Games
3rd - Spearhead From Space, Inferno, Carnival Of Monsters
4th - Robots Of Death, Talons Of Weng Chiang, Image Of The Fendhal
5th - Earthshock, Enlightenment, Snakedance
6th - Mark Of The Rani, Resurrection Of The Daleks
7th - Rememberence, Curse Of Fenric, Ghost Light
9th - The End Of The World, Empty Child/Doctor Dances, Bad Wolf/Parting
10th - Turn Left, Blink, Unicorn & The Wasp
11th - Angels two parter/The Lodger/The Pandorica Opens/Big Bang