Part Three
Series Episode Number: 388World Premiere: Sat 8 Feb 1975 - 5:32pm GMT [BBC One] (United Kingdom)
First Broadcast: Wed 5 Mar 1980 - 5:30pm CST [WTTW 11 Chicago]
Running Time: 24 minutes 5 seconds
11.20 Million (UK)
Chart Position: 17 () (UK)
Recorded on Mon 11 Nov 1974 in TC1
The Doctor subjects himself to a dangerous experiment so that he can access the memories of the dead Wirrn Queen. Elsewhere, the larvae Wirrn are pupating into their adult form.