King Neptune
After a short introduction, one of Neptune's mermaids is captured by a pirate ship, and their anchor chain entangles King Neptune; the various sea creatures launch a full-on assault on the pirate ship, and eventually the giant King himself gets free and creates major havoc for the ship.
Below are the streaming services currently carrying the movie “King Neptune” in the United Kingdom, along with how each offers it (subscription, buy, or rent) and a direct link. Licensing differs by market, so availability in the United Kingdom can differ from other countries.
Where to watch King Neptune in United Kingdom
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Not currently available on the supported providers in United Kingdom.
Availability can change as licenses rotate — confirm on the provider’s page before subscribing. Last checked: 20 Sept 2026.