Part OneSeries Episode Number: 588
World Premiere: Tue 1 Feb 1983 - 6:50pm GMT [BBC One] (United Kingdom)
First Broadcast: Mon 3 Dec 1984 - 11:00pm CST [WTTW 11 Chicago]
Running Time: 24 minutes 3 seconds
6.50 Million (UK)Appreciation Index: 67 (UK)
Chart Position: 103 () (UK)
Caught in a warp ellipse, the TARDIS is drawn to a huge spacecraft orbiting Earth whereupon the Doctor is separated in space and time from Nyssa and Tegan.