Part FiveSeries Episode Number: 644
World Premiere: Sat 4 Oct 1986 - 5:47pm BST [BBC One] (United Kingdom)
First Broadcast: Sun 4 Dec 1988 - 11:00pm CST [WTTW 11 Chicago]
Running Time: 24 minutes 42 seconds
4.80 Million (UK)Appreciation Index: 71 (UK)
Chart Position: 76 () (UK)
The next story the Valeyard shows the Doctor sees the TARDIS arrives on Thoros-Beta, homeworld of the Mentors and the Doctor's old foe, Sil...