Synopsis: Neutralising Earth's satellite network, the Daleks are able to land a flying saucer beneath the sea and establish a control area. The Doctor suspects an invasion but Whitehall refuse to take his recommendations seriously. Using the TARDIS to investigate, the Doctor infiltrates the Dalek craft just in time to witness the Daleks' subjugation of a Royal Navy nuclear submarine by mind control. The Doctor is able to turn the Daleks' plan to his advantage when he orders the submarine commander to fire upon the Dalek craft. However, the Doctor may not be able to escape to the TARDIS before the missile strikes.
Notes: Countdown #112
Reprinted in 1977's Doctor Who Winter Special as a Fourth Doctor story.