Star Trek: New Voyages

When the crew of the Enterprise is forced to accept the death of Captain Kirk, Spock and McCoy must come to terms with their own grief, but when Spock discovers a plot by the Klingons to send Kirk back in time in order to destroy the Federation, it will take all the courage and abilities of the crew of the Enterprise to rescue their beloved Captain in time before he succumbs to the horrific torture of the Mind-Sifter.