The Time Vortex, also known as the Time and Space Vortex, the Space-Time Vortex, and simply the Vortex, was the dimensional plane where time and space met, intersecting at an angle determined by non-Euclidean geometry.
According to some accounts, all time travellers passed through the Vortex, often using space-time travel machines and devices including TARDISes and vortex manipulators to achieve "time-flight." However, other accounts indicate that there were other dimensional planes where one could travel through time and space.