A time-travelling villain seeks revenge for the destruction of his homeworld. A freshly minted Enterprise and it's youthful crew head off to sort it out.
Oodles of visual razzamatazz (and nary a pause for breath) hide a fairly routine Trek outting (oddly reminiscent of the last one, Nemesis, in fact). A couple of very good character moments and the plot conceit that means anything can happen work for it and bode well for the next installment.
Whatever the complaints of fanboys, including at one point myself, this is a pretty fantastic film, and a necessary reboot of what was a comatose franchise. There are some things that don't work, as in any film, but what does work works surprisingly well (not the lens flare, though). There is a lot of respect for the original series, especially in the choice to set this in an alternate reality, where anything can happen. "'There are always possibilites,' Spock said" to quote Kirk in The Wrath of Khan.
Note: Main cast (Kirk through Ayel) is listed first, then rest of cast in general order of appearance. I did lump the Enterprise and Narada crews together, though. Can't say I got everyone, but I think I have gotten everyone with a significant appeararance onscreen.