Part Four
Series Episode Number: 499World Premiere: Sat 13 Jan 1979 - 6:27pm GMT [BBC One] (United Kingdom)
First Broadcast: Fri 20 Apr 2001 - 10:30pm CDT [Prairie Public Television]
Running Time: 21 minutes 58 seconds
9.90 Million (UK)
Appreciation Index: 63 (UK)Chart Position: 31 () (UK)
Recorded on Wed 11 Oct 1978 in Television Centre 6
With Kroll on the rampage, the Doctor and Romana are appalled to discover that Thawn intends to fire a rocket at the creature which will also kill the Swampies. Can the Doctor find the fifth segment in time to save the day?