Star Trek Beyond/Summary/Act One

:"Captain's log, stardate 2263.2. Today is our 966th day in deep space, a little under three years into our five-year mission. The more time we spend out here, the harder it is to tell where one day ends and the next one begins. It can be a challenge to feel grounded when even gravity is artificial. But, well, we do what we can to make it feel like home. The crew, as always, continues to act admirably despite the rigors of our extended stay here in outer space. And the personal sacrifices they have made. We continue to search for new life forms in order to establish firm diplomatic ties. Our extended time in uncharted territory has stretched the ship's mechanical capacities. But fortunately our engineering department, led by Mr. Scott, is more than up to the job. The ship aside, prolonged cohabitation has definitely had effects on the interpersonal dynamics. Some experiences for the better, and some for the worse. As for me, things have started to feel a little episodic. The farther out we go, the more I find myself wondering what it is we're trying to accomplish. If the universe is truly endless, then are we not striving for something forever out of reach? The Enterprise is scheduled for a reprovisioning stop at Yorktown, the Federation's newest and most advanced starbase. Perhaps a break from routine will offer up some respite from the mysteries of the unknown."
The stardate is 2263.2. It has been nine hundred and sixty-five days since the USS Enterprise began its five-year mission. The Enterprise docks at Starbase Yorktown, an extensive deep space colony containing a large city, to replenish dwindling supplies while the crew takes shore leave. Struggling to find continued meaning in his duties as captain, and becoming increasingly affected by thoughts of the death of his father, , Kirk applies for a promotion to vice admiral. 
Meanwhile, Spock and deal with a time-out in their relationship; reunites with his husband and their young daughter; and Montgomery Scott struggles to keep the ship operational. Spock is also distraught to find that his alternate reality counterpart has recently passed away.
An escape pod is found drifting out of a nearby nebula and its occupant, Kalara, claims her ship is stranded on the planet Altamid, which is located past the dangerous, unexplored nebula that will block communications with Starfleet. In a meeting with Yorktown's commanding officer Commodore , Kirk volunteers the Enterprise for the rescue mission, and they get through the nebula with some difficulty, and eventually arrive at Altamid, which Spock finds to be a sparsely-populated class M world. Not long after arrival, the Enterprise comes under attack from a swarm of thousands of small, heavily-armed alien ships. Kirk orders a counterattack, but the Enterprise is overwhelmed by the enemy's sheer volume and strength; the ship's phasers, navigational deflector, and warp nacelles are destroyed within minutes.
With the Enterprise crippled and helpless, several of the attacking ships breach the hull, and a boarding party commanded by the swarm's leader, Krall, boards the ship. They make their way to the ship's vault, and on the way there Krall captures and drains the life force from several Enterprise crewmen, leaving them as withered husks. Scott attempts to restore power to the ship's impulse drive by feeding it from the warp core, but Krall orders the swarm to resume its attack. They destroy the neck section of the Enterprise, separating the saucer and engineering hulls, and leaving the saucer powerless due to Scott's modifications, leaving no way of switching over to the saucer's reserve power without a separation. Spock and Dr. McCoy are in a turbolift car that is ejected into space and subsequently captured by a swarm craft, but they managed to get into the craft and overpower its occupants.
Krall arrives at the ship and attempts to get to the vault to take the artifact from the Enterprises mission from Teenax. However, Kirk gets to the artifact first and gives it to Ensign Syl before ordering the crew to abandon ship. As the separated engineering hull begins to disintegrate, most of the crew escape in , only for the swarm ships to capture them and drag them back to the planet. Seeing this, Scott fires himself out of the ship in a advanced long-range torpedo casing.
Kirk goes to separate the saucer from the neck but Krall attacks him before Kirk can initiate the separation. Uhura goes on to separate the saucer and gets left behind with Krall in the neck section while Kirk is on the saucer side.
Kirk reaches the bridge, which by now is occupied only by Sulu, , Kalara, and a few other crewmen. However, Chekov reports that the saucer is too badly damaged to keep in orbit, and will crash within minutes. Kirk orders the remaining crew to abandon the ship by Kelvin pods once it enters the atmosphere (though everyone except for himself, Chekov, and Kalara are also captured), and is the last person to leave the Enterprise. Moments later, the saucer crashes into a mountain range, and what remains of it crash-lands in a field, embedding itself into the earth.