The Doctor and Romana have unfinished business in Cambridge, 1979, with the elderly Professor Chronotis.
"Beware the sphere. Beware Skagra. Beware Shada. The secret is in the - ". What can the Professor's last message mean?
Without the Professor, the Doctor and Romana are forced to think on their feet. But what large invisible object lurks nearby?
The Doctor, Chris and K9 race to rescue Romana from Skagra. Claire makes a startling discovery about the Professor's rooms.
Answers come thick and fast in this penultimate episode. But no explanation can prepare anyone for what they find on Shada.
Answers come think and fast, but no explanation can prepare the Doctor, Chris and K9 for what they find on Shada.
Things look desperate. Skagra is almost within grasp of Salyavin's power. Can the Doctor save the day with his special helmet?
The good Doctor made a comeback to TV in 2005.