After conquering R'yleh and the Frozen Kingdom young Howard Lovecraft must now travel to the Undersea Kingdom in order to free his captured family, protect three mysterious magical books, and prevent the impending wrath of Cthulhu.
Unfortunately the movie Howard Lovecraft & the Undersea Kingdom is not yet available on HBO Max.
| Visual Effects | Saumik Chaudhuri | Compositing Artist |
| Writing | Thomas Boatwright | Writer |
| Editing | Ryan Goebel | Editorial Services |
| Production | Sean Patrick O'Reilly | Producer |
| Visual Effects | Billy Zhao | Animation |
| Sound | Andrew Osano | Orchestrator |
| Editing | Rob Neilson | Colorist |
| Writing | Bruce Brown | Writer |
| Writing | Erik Fokkens | Writer |
| Writing | E.T. Dollman | Writer |
| Production | Michelle O'Reilly | Producer |
| Editing | Sean Phillip Rowe | Editor |
| Writing | Dwight MacPherson | Writer |
| Sound | Josh Plotner | Musician |
| Crew | Aaron Bartscht | Score Engineer |
| Writing | H.P. Lovecraft | Writer |
| Writing | Sean Patrick O'Reilly | Writer |
| Directing | Sean Patrick O'Reilly | Director |
| Sound | George Streicher | Original Music Composer |
