When I was a kid in the 90’s, or early 00’s, I remember a scene from a kids movie where two characters were in a strange alien world (possibly underwater) and looking at a river where the water flowed uphill. Later on there is some kind of alien being that spoke with a very soft, almost pidgeony(?) voice and asked them for help with something. I remember the alien was bald and pale.

It was in English, but I cant remember if it was a cinema movie or a TV movie. It was in colour and I probably watched around 1999 if that helps…