2D universe
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"The Boneless's universe" might be more suitable for this topic.
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- You may be looking for the DWM universe.
The Boneless came from a universe with only two spatial dimensions. When the Twelfth Doctor eventually confronted the Boneless, he used his TARDIS to send the creatures back to their original 2D universe. (TV: Flatline [+]Loading...["Flatline (TV story)"])