Rip engine

A Rip engine was a device that allowed for time travel. As Jack put it, it was "a crude method of time travel."

The Ninth Doctor intended to take Rose and Jack to the planet Kegron Pluva but instead arrived in 2005 Bromley to investigate a time distortion. There, he encountered Das, a Neanderthal who was transported from 29,185 BC to 2005 by a rip engine. It prevented him from travelling in time again. (PROSE: Only Human)