Two TARDISes can be Remote-Paralleled so that where ever one goes the other will go too. A variation of this function allows an operator who has access to the Control Crystal of another TARDIS to use his TARDIS to enact Parallel Control over the other TARDIS. This allows him to remotely operate almost all the systems of the other TARDIS. Parallel control can even be used to have precise control over a TARDIS equipped with a symbiotic bypass.

Both forms of parallel control can be thwarted by reversing the time vector drive. However this tears a rift in Vortex drains the power of both TARDISes to the point where there is not enough to jump start the systems.