Doctor Who doesn't *need* the Daleks. However, having them in will attract casual viewers and, assuming that the story is half-decent (and given the people involved it'll almost certainly be fairly good or better) then it'll get those viewers watching the rest of the series. So they are a ratings boost and a hook for casual viewers rather than a necessity.
Well, the best guide to who the Daleks are, is probably the Dalek entry on this page:
http://www.lofficier.com/dwudd.html
There are loads of Doctor Who sites with pictures of Daleks, but this is the Dalek gallery on the official Doctor Who site:
http://www.bbc.co.uk/cult/doctorwho/gallery/dalek/
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Doctor Who doesn't *need* the Daleks. However, having them in will attract casual viewers and, assuming that the story is half-decent (and given the people involved it'll almost certainly be fairly good or better) then it'll get those viewers watching the rest of the series. So they are a ratings boost and a hook for casual viewers rather than a necessity.
Well, the best guide to who the Daleks are, is probably the Dalek entry on this page: http://www.lofficier.com/dwudd.html There are loads of Doctor Who sites with pictures of Daleks, but this is the Dalek gallery on the official Doctor Who site: http://www.bbc.co.uk/cult/doctorwho/gallery/dalek/