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Gilliatt, a fisherman-turned-smuggler on the isle of Guernsey, agrees to transport a beautiful woman to the French coast in the year 1800. She tells him she hopes to rescue her brother from the guillotine. Gilliatt finds himself falling in love and so feels betrayed when he later learns this woman is a countess helping Napoleon plan an invasion of England. In reality, however, the "countess" is an English agent working to thwart this invasion. When Gilliatt finds this out, he returns to France to rescue the woman who's true purpose has been discovered by the French.

How to Watch Sea Devils Legally and Safely

If you want to stream Sea Devils through reputable and legal services, there are a few good options depending on where you are. Subscription platforms like HBO Max, Disney+, Netflix, Amazon Prime Video, and Apple TV+ sometimes carry Sea Devils films or related DC titles—though availability depends on your country.

If you’d rather not commit to a subscription, there are ad‑supported, free (but legal) platforms such as Tubi, Pluto TV, Peacock or Crackle (where available in your region) that occasionally host superhero films.

Lastly, don’t forget about library‑linked streaming options like Kanopy or Hoopla (if your library or university is registered), and official uploads by film distributors on YouTube—these can also give you legal access to classic movies.