Ian and Vrestin fall into caverns beneath the surface of Vortis and encounter the Optera. The Doctor finds the landing site of the Menoptra, and the Zarbi prepare to ambush them.
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Ian and Vrestin fall into caverns beneath the surface of Vortis and encounter the Optera. The Doctor finds the landing site of the Menoptra, and the Zarbi prepare to ambush them.
BBC One
