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Mr Moto's Last Warning: A Japanese man claiming to be Mr Moto, of the International Police, is abducted and murdered soon after disembarking from a ship at Port Said in Egypt. The real Mr Moto is already in Port Said, investigating a conspiracy against the British and French governments. The dead man was his colleague, impersonating him to throw the conspirators off his scent. Mr Moto recognises one of the conspirators as a British Secret Service agent, and together they discover that the gang have mined the harbour in preparation for the arrival of the French fleet. Their aim is to throw the blame onto the British, which may start a second World War.

How to Watch Mr Moto's Last Warning Legally and Safely

If you want to stream Mr Moto's Last Warning 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 Mr Moto's Last Warning 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.