Zygon invasion of Earth

The Zygons attempted an invasion of Earth after their homeworld was destroyed in the first days of the Time War. (TV: , PROSE: )
== History ==
=== Aftermath and legacy ===
Category:Conflicts
Category:16th century Earth-based conflicts
Category:21st century Earth-based conflicts
Category:English conflicts
Category:British conflicts
Category:UNIT conflicts
Category:Zygon conflicts
Category:Conflicts involving the Eleventh Doctor
Category:Conflicts involving the Tenth Doctor
Category:Conflicts involving the War Doctor