Looking for a late 80s/Early 90s fantasy film:
- Boy is given necklace with green gem from grandfather.
- The necklace opens a portal to a fantasy world in the basement. I believe the gem creates a door which the boy goes through. He is unable to return until the task he is given is completed. There may have been a small word-based ritual that activated the gem.
- Boy befriends frog creature.
- Large Zeus-like giant king on throne.
- Targeted towards Children.
- Last remember watching in the late 90s.
- It is not Never-ending story, Storybook, or PageMaster.
Anyone have any ideas? I have already gone through all of the "80s/90s Fantasy/sci-fi" lists on IMDB, and have searched every combination of search terms on Google.