Stephen King movies are bit hit or miss, but I'd stick up for the classic vampire movie Salems Lot. Also Silver Bullet, which is a great werewolf movie, but also can be enjoyed by older kids.|
The Howling is another great werewolf movie and the and worth watching for the special effects and the gorgeous Elisabeth Brooks getting her kit off.
And John Carpenter's Prince of Darkness deserves a mention alongside with Halloween and The Fog
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