This season aired between 3rd September 1977 to 11th March 1978. It featured The 4th Doctor with Leela and K9. The main enemies/aliens are The Rutans, The Swarm, The Fendahl, Gatherer Hade, The Collector, Minyans, Sontarans and The Time Lords. The episodes are:

92. Horror of Fang Rock

93. The Invisible Enemy

94. Image of the Fendahl

95. The Sun Makers

96. Underworld

97. The Invasion of Time

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