Star Trek: United

Story: The Enterprise crew, and especially Captain Kirk, are reeling from the recent death of just promoted Lieutenant Chekov, when they recieve a sub-space transmission from Commodore Matt Decker. Tensions have recently been rising between the Klingons and Romulans, and there's a stand-off in progress between the two, in a system on the border between their two empires, which could lead to all-out war. The Federation can't afford to be caught in the middle, so Kirk and the Enterprise must go, and defuse the situation.

Once there, Kirk and Spock meet with the commanders of the two opposing fleets, the Klingon Kor, and the Romulan Lari(name is from SFDebris). According to Kor, the Romulans have secretly developed a super-weapon that they've been using to obliterate Klingon outposts along their border, leaving only craters. Lari protests, claiming the Romulan Empire has no such weapon.

Meanwhile, on the ship, newly assigned Ensign Janice Rand picks up a very large and extremely fast object headed straight for the system, forcing those on the planet below to return to their ships. On returning to the Enterprise, Kirk is informed they have visual on the approaching object, which is put up on the viewscreen:

The Borg have arrived early.

Obviously, the already established cast would be the same, but here's the new characters:
 * Commodore Matt Decker: Vince Vaughn
 * Ensign Janice Rand: Willa Holland
 * Kor: Michael Shannon
 * Commander Lari: Lena Headey
 * Worf(the one from Star Trek VI): Omar Sy
 * Nurse Christine Chapel: Kirsten Dunst