This TARDIS was a Type 12, Mark 1 TARDIS, a much earlier version than the Doctor's Type 40, which Chronotis had salvaged from the scrap heap before leaving Gallifrey. It could interfere in an individual's time stream, as Clare Keightley discovered when she reactivated the ship's controls, causing the previously deceased Chronotis to come back to life. (HOMEVID: Shada, WC: Shada, AUDIO: Shada, PROSE: Shada)