Well I mostly watch sci-fi shows so these may not appeal to you but I'll list them anyway:
Teen Wolf
Supernatural
Doctor Who - Best show regardless of the audience it's aimed at, watched this over again for 5 times now!
Battlestar Galactica
Fringe (love this)
The Big Bang Theory
Heroes
Stargate: Universe
Dexter (not sci-fi but really good)
Game Of Thrones
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