This season aired between 2nd September 1978 to 24th February 1979. It featured The 4th Doctor with Romana and K9. The main enemies/aliens are Graff Vynda-K, The Ribosians, The Captain, Cessair of Diplos, Ogri, Taran Androids, Thawn, Kroll, The Marshal, The Black Guardian and The Shadow. The episodes are:

98. The Ribos Operation

99. The Pirate Planet

100. The Stones of Blood

101. The Androids of Tara

102. The Power of Kroll

103. The Armageddon Factor 

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