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This season aired between 28th December 1974 to May 10th 1975. It featured The 4th Doctor with Sarah Jane Smith and Harry Sullivan. The main enemies/aliens are K1, the Wirrn, The Sontarans, The Daleks, Davros and the Cybermen. The episodes were:

75. Robot

76. The Ark in Space

77. The Sontaran Experiment

78. Genesis of the Daleks

79. Revenge of the Cybermen

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