When an alien spacecraft of enormous power is spotted approaching Earth, Admiral James T. Kirk resumes command of the overhauled USS Enterprise in order to intercept it.
With the assistance of the Enterprise crew, Admiral Kirk must stop an old nemesis, Khan Noonien Singh, from using the life-generating Genesis Device as the ultimate weapon.
Admiral Kirk and his bridge crew risk their careers stealing the decommissioned U.S.S. Enterprise to return to the restricted Genesis Planet to recover Spock's body.
In 2286, an enormous cylindrical probe moves through space, sending out an indecipherable signal and disabling the power of every ship it passes. As it takes up orbit around Earth, its signal disables the global power grid and generates planetary storms, creating catastrophic, sun-blocking cloud cover. Starfleet Command sends out a planetary distress call and warns all space-faring vessels not to approach Earth.
Captain Kirk and his crew must deal with Mr. Spock's long-lost half-brother who hijacks the Enterprise for an obsessive search for God at the center of the galaxy.
On the eve of retirement, Kirk and McCoy are charged with assassinating the Klingon High Chancellor and imprisoned. The Enterprise crew must help them escape to thwart a conspiracy aimed at sabotaging the last best hope for peace.