Looks like the cast has been nailed down:
James Tiberius Kirk:
Best known as: Anne Hathaway's boy toy in Princess Diaries 2.
Also known as: Lindsay Lohan's boy toy in some crappy movie of hers.
Best known as: Gabriel Grey on Heroes.
Also known as: Kim Bauer's CTU Supervisor on 24.
Best known as: Somebody with a funny name in those LOTR movies.
Also known as: The Russian guy who killed Matt Damon's girlfriend in The Bourne Supremecy.
Best known as: Shaun of the Dead.
Also known as: Comic relief in Abram's MI:3.
Best known as: Harold & Kumar go to White Castle.
Also known as: MILF guy #1 in American Pie movies.
Best known as: Johnny Depp's girl toy in Pirates of the Carribean.
Also known as: Nick Cannon's girl toy in Drumline.
Best known as: Hank Azaria's son on Huff.
Also known as: Anthony Hopkin's sidekick in Hearts of Atlantis.
Nero (Big Bad, probably Romulan):
Best known as: Don't make Hulk angry!
Also known as: Hector of Troy.