A warp gate was a connection between dimensions or parallel universes used as a means of traveling between the two.
The Lepus Warriors attempted to invade Earth in 1923 by disguising a warp gate to their home dimension as a top hat used by the stage magician Miraclo. (COMIC: The Hat Trick)
Death's Head was mysteriously transported to the "robot universe" through a warp gate. The Seventh Doctor later admitted he was the person who had done so. (COMIC: The Incomplete Death's Head)
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