This season aired between 10th August 1968 to June 21st 1969. It featured The 2nd Doctor with Jamie McCrimmon and Zoe Heriot. The main enemies/aliens are The Dominators, Quarks, Cybermen, The Krotons, The Ice Warriors and The Time Lords. The episodes are:
44. The Dominators
45. The Mind Robber
46. The Invasion
47. The Krotons
50. The War Games