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|Place of origin:||Parallel Torchwood|
|First seen in:||Doomsday|
|Appearances:||TV: Journey's End|
First version (Battle of Canary Wharf) Edit
After the Cybermen left Pete's World to travel to the Doctor's universe, Torchwood created a device that could hop to another universe. This first version resembled a yellow disc. It would hang by someone's neck like a necklace and could 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 Tenth Doctor sucked the Cybermen and the Daleks in the Void, the breach closed itself because of the amount of Void stuff present. The devices stopped working as a result. (TV: Doomsday)
Second version (War in the Medusa Cascade) Edit
This new version, unlike the original, was handheld and could travel to different parts in space, but needed to recharge for thirty minutes after each use. The dimension cannon could also measure timelines.
Mickey and Jackie also used it to help save Sarah Jane Smith from a pair of Daleks following their invasion of Earth.
Following the invasion and Davros being prevented from using the reality bomb in the Doctor's universe, the walls of the universe eventually started closing themselves, a process that the DoctorDonna called a dimensional retroclosure. (TV: Journey's End)