Tv series name help?

I remember seeing a tv series episode quite a few years ago where the main characters are fighting against a gigantic Demon that has appeared in the City. The creature's shadow falls upon people and they die. But when the shadow hits the hero he kills it somehow.

Anonymous2015-12-29T18:50:12Z

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Sounds like season 1 finale of Torchwood actually. Kind of a goofy episode. Jack kills it because he's immortal.

edit: Was this it?
https://www.youtube.com/watch?v=GLXQm3vTv_Q

The part before this where they all betray and murder Jack was good, but the demon was just goofy.