Dimensional transporter
Dimensional transporters, also known as parallel world transporters, were pieces of teleportation technology.
Mechanics
They allowed a person (if the walls of time were down) to teleport themselves from universe to universe. They could also teleport great distances and through the Void. (TV: Army of Ghosts/Doomsday)
History
When the Cybermen made their way into the Doctor's universe through a crack in the Void, they began a plan to invade it and convert humanity into Cybermen. Mickey Smith had followed them through, (TV: Army of Ghosts) leading the way for others such as Jake Simmonds, Peter Tyler and the Preachers to follow, and help defeat the Cybermen. (TV: Doomsday) Pete later used it to save his daughter Rose from being pulled into the Void. (TV: Doomsday) Rose travelled from Pete's World to the Doctor's universe during the Dalek invasion of Earth, hoping to the find the Tenth Doctor. Mickey and Jackie also followed Rose, and saved Sarah Jane Smith from a squad of Daleks. (TV: Journey's End)
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Medallions were a type of dimensional transporter from Pete's World to teleport to the same place in other universes when the Void was open. (TV: Doomsday)
Similar objects could also allow members from Pete's World to teleport to Donna's World and also the real universe. (TV: Turn Left, Journey's End)
