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.
Unfortunately the movie King Neptune is not yet available on HBO Max.
| Production | Walt Disney | Producer |
| Sound | Bert Lewis | Original Music Composer |
| Visual Effects | Johnny Cannon | Animation |
| Visual Effects | Les Clark | Animation |
| Visual Effects | Norman Ferguson | Animation |
| Visual Effects | Frenchy de Trémaudan | Animation |
| Visual Effects | Ben Sharpsteen | Animation |
| Visual Effects | Chuck Couch | Animation |
| Visual Effects | Hardie Gramatky | Animation |
| Visual Effects | Harry Reeves | Animation |
| Visual Effects | Dick Williams | Animation |
| Visual Effects | Jack King | Animation |
| Visual Effects | Dick Lundy | Animation |
| Visual Effects | Bill Roberts | Animation |
| Visual Effects | Charles Hutchinson | Animation |
| Visual Effects | Hamilton Luske | Animation |
| Visual Effects | Ed Love | Animation |
| Visual Effects | Paul Fennell | Animation |
| Visual Effects | Joseph D'Igalo | Animation |
| Visual Effects | Eddie Donnelly | Animation |
| Visual Effects | Charles Byrne | Animation |
| Visual Effects | Fred Spencer | Animation |
| Directing | Burt Gillett | Director |
| Visual Effects | David Hand | Animation |
