Dimension Cannon
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The Dimension cannon or the Dimension jump is a device that can travel to different dimensions by ripping a hole in the universe and hopping through the Void, at the cost of breaking the walls of the universe.It was created in Pete's World by Torchwood.
History
First Version (Battle of Canary Wharf)
After the Cybus Cybermen left Pete's World to travel to our universe, Torchwood created a device that can hop to another universe. This first version resembled a yellow disc, this device would hang by someone's neck like a necklace and would teleport at the same position on the chosen world where they teleported from the other world. The use of the Dimension cannon opened the breach further and further and raised the temperature on Pete's World. After the Doctor sucked the Cybermen and the Daleks in the Void, the breach closed itself because of the amount of Void stuff.(DW: Doomsday)
Second Version (War in the Medusa Cascade)
In Pete's World, Rose, Mickey Smith and Jackie Tyler used a new Dimenson Cannon that once again broke the walls of the universe to enter our unverse.The walls of the universe eventually started closing themself, a process that the DoctorDonna called a dimensional retroclosure. This new version unlike the original, was handheld and could travel to different parts of the space, but needs to recharge for 30 minutes after each use. The Dimension cannon could also measure time lines.(DW: Journey's End)
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The Dimension Cannon was a device used in Pete's World invented by Torchwood. Rose Tyler used the device several times to try find the Doctor. Mickey and Jackie also used it to help save Sarah-Jane Smith.
The cannon was originally designed and constructed with the intention of allowing passage between universes, however it was unable to break through the barriers separating them. Because of this, the device didn't function at all until the events of the Dalek Invasion of Earth , when the walls of reality started to break down. In the aftermath of the war, it is stated that the walls would repair themselves, suggesting that the cannon will once again not function. (DW: The Stolen Earth / Journey's End)
