THIRD DOCTOR: JON PERTWEE
ELEVENTH SEASON
UUU. The Time Warrior
FOURTH DOCTOR: TOM BAKER
TWELFTH SEASON
4B. The Sontaran Experiment
FIFTEENTH SEASON
4Z. The Invasion of Time
SIXTH DOCTOR: COLIN BAKER
TWENTY-SECOND SEASON
6W. The Two Doctors
TENTH DOCTOR: DAVID TENNANT
THIRTY-FIRST SEASON
The Sontaran Stratagem
1) The Sontaran Stratagem
2) The Poison Sky