Spoilers are precisely defined here. Rules vary by the story's medium. Info from television stories can't be added here until after the top or bottom of the hour, British time, closest to the end credits roll on BBC One. Therefore, fans in the Americas who are sensitive to spoilers should avoid Tardis on Sundays until they've seen the episode.
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This page lists appearances of the Zygons the order in which they experience them.This timeline is based upon observations of the Doctor Who universe and the events that occur during each of these stories.