The Zygons attempted an invasion of Earth after their homeworld was destroyed in the first days of the Time War. (TV: The Day of the Doctor [+]Steven Moffat, 50th Anniversary Specials (BBC One, 2013)., PROSE: The Day of the Doctor [+]Steven Moffat, adapted from The Day of the Doctor (Steven Moffat), Target novelisations (Target Books, 2018).)
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- Main article: Operation Double