Part ThreeSeries Episode Number: 394
World Premiere: Sat 22 Mar 1975 - 5:30pm BST [BBC One] (United Kingdom)
First Broadcast: Thu 13 Mar 1980 - 5:30pm CST [WTTW 11 Chicago]
Running Time: 22 minutes 38 seconds
8.50 Million (UK)
Chart Position: 42 () (UK)
Recorded on Mon 10 Feb 1975 in TC8
The Doctor informs the Kaled government of Davros's experiments and they move to shut down the bunker. But Davros is one step ahead and prepares to take drastic action.