This season aired between 30th August 1975 to March 6th 1976. It featured The 4th Doctor with Sarah Jane Smith and Harry Sullivan. The main enemies/aliens are The Zygons, The Skarasen, the Anti-Matter Creature, Sutekh, Kraals, Morbius and Krynoids. The episodes are:

80. Terror of the Zygons

81. Planet of Evil

82. Pyramids of Mars

83. The Android Invasion

84. The Brain of Morbius

85. The Seeds of Doom

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