sifi movie about a family going to the future

I remember this movie about a family who lives in what seemed to be the 60s with a style that reminds me of Edward scissor hands. I remember they go to what I believed was the future, There was a villain whos goal was to steal the fathers wife and kid/kids. The only two scenes I remember was of when the father gets thrown into a sewer system and meets these creatures, I believe he gave them a piece of candy and they get hostile and he escaped by finding a ladder over a chasm. The other scene I when the villain gets his comeuppance and is thrown into the sewer himself and is eaten by the creatures.

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