Parallel universe
A parallel universe is a reality created when historical events diverge from the main timeline. Unlike alternate timelines, these occur naturally. Travel to parallel universes became impossible after the Last Great Time War. (DW: Rise of the Cybermen)
In the 1970s, the Doctor visited a parallel universe in which the United Kingdom was a fascist Republic ruled by an alternate Doctor. (DW: Inferno, NA: Timewyrm: Revelation)
- For full details see the article Parallel Earth (Inferno).
Circa 1979, the Doctor visited a universe in which the Roman Empire spanned the galaxy and was beginning to conquer other universes. (DWM: The Iron Legion)
One parallel universe was lifeless and empty due to the destruction of Logopolis in 1981. (PDA: The Quantum Archangel)
In the 1990s, Carbury was invaded by knights from a parallel universe which bore similarities to Arthurian legend. (DW: Battlefield)
- For full details see the article Arthur's World.
In 2007, the Doctor, Rose Tyler and Mickey Smith visited a universe in which Rose's father was still alive. (DW: Rise of the Cybermen)
- For full details see the article Pete's World.
In 2008, Ianto Jones accepts the offer of Mairwyn, does not die when the 456 invade, and Mairwyn enslaves Earth. The two later visit the 'real' universe to observe Ianto's funeral.
- For full details see the article Shrouded.
