I saw the first one and have the second to watch at the weekend (thank you the inventor of sky plus
basic story ~ a bright light comes down and hoovers above a navy ship, all the crew go dolally and kill each other or jump over board, in the middle of the ocean....however they start turning up on dry land
goverment team then put into place to activate "the plan"
everyone who has seen the light acts oddly and they of course think ET etc
the cast is very interesting I have to admit, people who you would never really see in scifi, including Peter Dinklage who is a "little person" and plays a sex mad linguist, it also stars Brent Spinner, wierd to see him with normal colour skin and a tatty jumper on! he plays a forensic microbiologist.
I think its worth a watch, even if its just the first few episodes to see what you make of it, and with saying that I have only seen the first one myself!