Part Two
Series Episode Number: 407World Premiere: Sat 4 Oct 1975 - 5:46pm BST [BBC One] (United Kingdom)
First Broadcast: Wed 2 Apr 1980 - 5:30pm CST [WTTW 11 Chicago]
Running Time: 22 minutes 30 seconds
9.90 Million (UK)
Chart Position: 24 () (UK)
Recorded on Tue 01 Jul 1975 in TC6
The Doctor and Sarah are held responsible for the deaths on Zeta Minor, but the Time Lord knows that the real culprit comes from the mysterious universe of antimatter.