McGarrett and Danny's relaxing day at sea takes a deadly turn when their boat is hijacked and they are left to die in the middle of the ocean.
Kirk and Spock are caught up in a revolution on a planet where intellectuals and artists live in a utopian city in the sky.
Kirk is forced into negotiating peace on a planet with severe class inequities.
As Enterprise prepares to enter the subspace corridor that will get them to their rendezvous with Degra, they encounter a duplicate Enterprise manned by the original crew's descendants.
A nervous and insecure officer places the Enterprise in great danger when he spends his time acting out his fantasies on the holodeck and neglects his duties in Engineering.