7.6
150 min
The Doctor and Jo visit the Master in his high-security prison on an island off the south coast of England. The governor, Colonel Trenchard, says ships have been disappearing mysteriously at sea. The Doctor discovers that Trenchard and the Master are in league to contact the Sea Devils, a race of reptiles in hibernation in a base beneath the sea, who have been awoken by recent work on a nearby sea fort. The Master intends to use his new allies to help him conquer the world!
| Name | Character | Team | |
|---|---|---|---|
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Jon Pertwee | The Doctor | Unowned |
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Roger Delgado | The Master | Unowned |
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Katy Manning | Jo Grant | Unowned |
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Edwin Richfield | Captain Hart | Unowned |
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Clive Morton | Trenchard | Unowned |
| June Murphy | 3rd Officer Jane Blythe | Unowned | |
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Donald Sumpter | Commander Ridgeway | Unowned |
| David Griffin | Lt. Commander Mitchell | Unowned | |
| Hugh Futcher | Hickman | Unowned | |
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Royston Tickner | Robbins | Unowned |
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Pat Gorman | Sea Devil | Unowned |
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Peter Forbes-Robertson | Chief Sea Devil | Unowned |
| Declan Mulholland | Clark | Unowned | |
| Alec Wallis | Ldg. Telegraphist Bowman | Unowned | |
| Brian Justice | Castle Guard Wilson | Unowned | |
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Terry Walsh | Castle Guard Barclay | Unowned |
| Eric Mason | C.P.O. Smedley | Unowned | |
| Christopher Wray | Ldg. Seaman Lovell | Unowned | |
| Stanley McGeagh | Castle Guard Drew | Unowned | |
| Brian Vaughan | Lt. Commander Watts | Unowned | |
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Martin Boddey | Walker | Unowned |