Transmitted originally: 4 May 1974 to 8 June 1974.
They return to Earth in the TARDIS. The Doctor recognises the meditation centre abbot K'anpo as his former Time Lord guru and, at his promting, returns to Metebelis 3, where the humans revolt has failed. He demands an audience with the Great One - a huge mutated spider revered by the others - and offers her the crystal. The Great One uses it to complete a crystal lattice in her lair, which she believes will increase her mental powers to infinity. Instead, the rising power kills her. The other spiders also die as the mountain explodes. K'anpo has meanwhile been killed while protecting Yates from an attack by the spider-controlled residents of the meditation centre, only to be reborn in the form of his assistant Cho-je - his own future self. Some weeks later, the Doctor is brought back to UNIT HQ by the TARDIS, having been fatally affected by the radiation in the Great One's cave. K'anpo appears and, with his help, the Doctor regenerates.
The story features the second, and final appearance of the Whomobile.
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