Okay, so my friend and I started reminiscing, and we started talking about this movie that we both remember but very vaguely. So here are all the scattered details.

-Eary 80's to early 90's
-Animated kids movie
-Possibly flew/rode a cloud to a castle
-Main character: A guy named Philip (?)
-He opens doors inside a castle to evil or darkness and unleashes it to the kingdom
-At one point they were hiding in a log or under a bridge.

I know it's not a lot to work with, but it was worth a try.

Thanks!

Sounds like, little nemo adventures in slumberland