Changes to the material from "Attack on Cloudbase" were widely criticised: following the destruction of Cloudbase from the 1968 episode, the Mysterons use their powers to reverse time, leaving Cloudbase intact and stating that on this occasion they will spare the human race in a voice-over accompanied by the image of a CGI pyramid.
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A later assault on Cloudbase results in the total destruction of the Spectrum headquarters, but the Mysterons use their extraordinary abilities to rewind time, leaving the base intact ("Attack on Cloudbase").
Time travel, theorised and speculative concepts about travelling physically through time
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In physics, T-symmetry - the study of thermodynamics and the symmetry of certain physical laws where the concept of time is reversed — i.e. where a mirror (reverse) transformation is applied to a forward direction time state.
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