Part OneSeries Episode Number: 682
World Premiere: Wed 6 Sep 1989 - 7:35pm BST [BBC One] (United Kingdom)
First Broadcast: Mon 6 Jul 2015 - 10:00pm EDT [Retro TV]
Running Time: 24 minutes 6 seconds
3.10 Million (UK)Appreciation Index: 69 (UK)
Chart Position: 102 () (UK)
As UNIT are transporting a nuclear warhead around Carbury, knights in armour arrive to continue waging a war that began thousands of years ago, but in a wholly different dimension.