The Doctor and Jo visit the Master at his island prison where the Doctor becomes curious about a number of ships sinking in the area.
Did You Know?
The script called for Jo Grant and the Doctor to climb up a ladder to get into a sea fortress. The ladder proved too slippery for Katy Manning
, so stuntman Stuart Fell did the shot dressed as Grant. See more
The door to The Master's "cell" is fully riveted, indicating that it's supposed to be solid steel, however given the way it handles and the sound it makes on closing, it's clearly a wooden door painted to look oxidised. See more
The BBC wish to acknowledge the help given to them by the Royal Navy in the making of this programme See more
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