Part FourSeries Episode Number: 612
World Premiere: Fri 3 Feb 1984 - 6:41pm GMT [BBC One] (United Kingdom)
First Broadcast: Thu 14 May 2015 - 8:30pm EDT [Retro TV]
Running Time: 24 minutes 26 seconds
5.60 Million (UK)Appreciation Index: 65 (UK)
Chart Position: 112 () (UK)
The Doctor manipulates the Gravis into restoring the TARDIS. But he must find a way to break the Tractators' hold over Frontios before they wipe out all life on the surface.