Doctor Who: The Sea Devils
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!
Top cast
Jon PertweeThe Doctor
Roger DelgadoThe Master
Katy ManningJo Grant
Edwin RichfieldCaptain Hart
Clive MortonTrenchard- June Murphy3rd Officer Jane Blythe
Donald SumpterCommander Ridgeway- David GriffinLt. Commander Mitchell
- Hugh FutcherHickman
Royston TicknerRobbins
Pat GormanSea Devil
Peter Forbes-RobertsonChief Sea Devil
Below are the streaming services currently carrying the movie “Doctor Who: The Sea Devils” in Canada, along with how each offers it (subscription, buy, or rent) and a direct link. Licensing differs by market, so availability in Canada can differ from other countries.
Where to watch Doctor Who: The Sea Devils in Canada
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Not currently available on the supported providers in Canada.
Availability can change as licenses rotate — confirm on the provider’s page before subscribing. Last checked: 14 Sept 2026.