Reciprocator

From Tardis Wiki, the free Doctor Who reference

The Reciprocator was a machine possessed by the Ophidians that was capable of swapping bodies between different species.

Ophidians used the machine to save their species from extinction, as their bodies couldn't sustain them. After choosing Mobox as the best species to use, they began to swap their bodies with the kidnapped Mobox.

Destrii used the Reciprocator to swap her body with Izzy's, as she was being pursued, and then destroyed the machine by overloading it, in an attempt to kill Izzy. (COMIC: Ophidius)