Kirk on the U.S.S. Enterpris NCC-1701-B, Montgomery Scott decides to leave Starfleet. A chance encounter with a mysterious woman named Guinan leads him to hitch a ride on the U.S.S. Jenolen -- which crashes into a Dyson Sphere, leaving only Scotty to survive suspended as a transporter pattern....Seventy-five years later, he is revived aboard the Enterprise-D -- on which Guinan serves as bartender. But fate has not finished with either Scotty or Guinan. The engineer hatches an audacious plan to travel back in time and rescue Jim Kirk the moment before he would vanish into the nexus and bring him back to the twenty-fourth century without damaging the timeline.Scotty's plan, however, does not go as expected. Though Kirk is rescued, the famed captain and the engineer, as well as Captain Picard, Guinan, and the crew of the Enterprise-D, are trapped in an altered past where there is no Federation, and no human race. Sarek of Vulcan leads a ragtag collection of species fighting a losing battle against the Borg, who have swarmed into the Alpha Quadrant and assimilated Earth.Starfleet's finest miracle worker must find a way to restore the timeline before the galaxy is overrun....

    With the signed treaty safely in hand, they board the Starship Enterprise and head home. Spock is fascinated by the easy acceptance of his Vulcan culture by the bright, adventurous Starfleet crew headed by Captain Robert April and his first officer, Christopher Pike. Spock, half-Vulcan, half-human, is now torn between accepting his position at the Vulcan Science Academy or joining the cadets at Starfleet Academy. Before he can decide, however, he and Sarek discover that not everyone is happy with the treaty. First, rebel forces attempt an assault on the Enterprise, and then Spock's own family is stalked. Spock has a hunch about who is behind the attacks. But to find out -- and set the course for his own destiny -- he'll have to trust his human side.

    Now the Last Days are once again upon them, and a fiery star draws near. This is the Death-Bringer, the Eater of the World, whose coming heralds the end of all things....But to Captain Picard and the crew of the Starship Enterprise™; the Death-Bringer appears to be nothing but a rogue comet, easily destroyed. Picard faces a difficult dilemma: how can he save the Thanetians' rich and intricate civilization without destroying the very beliefs upon which their culture is based?This quandary is challenge enough, yet the captain's position becomes even more complicated when Deanna Troi discovers that, incredibly, the comet is alive!

    Enterprise is en route to Cygnus IV, home of the technologically illiterate Bandi and their mysteriously advanced Farpoint Station. After adding to its crew complement from Deneb IV they are harassed and prosecuted by an omnipotent being named Q, who claims that humanity has not progressed beyond barbarism. Captain Picard and the crew of the Enterprise must defend themselves by solving the mystery of Farpoint Station in a manner satisfactory to their newest judge and nemesis.