Project Revenant

Project Revenant was a Time Lord project set up by the War Council during the Last Great Time War. Its purpose was to resurrect the "most brilliant minds Gallifrey [had] ever seen" in order to win the war against the Daleks. (AUDIO: Celestial Intervention)

The only Time Lord to be resurrected was Rassilon. His Matrix projection was imprinted onto the Time Lord Valerian, killing Valerian in the process. (AUDIO: Desperate Measures)