Warp gate

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)

Behind the scenes

 * In NOTVALID: Scream of the Shalka, the Shalka use a warp gate, also known as a space-time tunnel to invade Earth from their homeworld.