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

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.