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Heroes seems to be more of a fantasy than Sci-fi — even though there is some lab “science” involved. For instance, the “catalyst” is this mysterious plasma carried by a particular human. Then there are the powers — flying, running at supersonic speed, etc. Please! All that said, it's one of my favourite programs.

Similarly, Dollhouse seems to be more fantasy than sci-fi. I'm reserving judgment on the entertainment value.

At the other end of the scale — Terminator is pure sci-fi. You could debate the likelihood of time travel; but the potential for AI robots going rouge is very real. It's too bad the ratings are low — perhaps “T4” (or whatever the final name is) will give it a boost.