Dimensional transporter

Dimensional transporters are metal discs with yellow discs inside that allow one to, if the walls of time are down, transport themselves from dimension to dimension and place to place. They are a bit lacking, as they take a way to recharge, but can teleport great distances and across the Void. It is unknown who invented them. They have been used by The Doctor, Pete Tyler, Mickey Smith, Jake Simmonds, Rose Tyler, Jackie Tyler as well unnamed Preachers. (DW: Doomsday, Journey's End)