Past and present collide and the fate of the universe hangs in the balance when, at long last, one story intertwines both crews of the Enterprise! Kirk and his crew must rescue a scientist before his evil captor can use him to conquer the galaxy, while 99 years away, Picard's crew is headed for a black hole that holds the key to the future of the Federation!
Spock's mother, Amanda Grayson, is dying, and Spock returns to the planet Vulcan where he and Sarek enjoy a rare moment of rapprochement. But just as his wife's illness grows worse, duty calls Sarek away, once again sowing the seeds of conflict between father and son. Yet soon Sarek and Spock must put aside their differences and work together to foil a far-reaching plot to destroy the Federation, a plot that Sarek has seen in the making for nearly his entire career.