A Klingon Battlecruiser has been detected near Federation outposts. The problem? The crew has been frozen for 75 years and thinks they are still at war.

This is the first time we see K’Ehleyr, who would become the mother of Worf’s son, Alexander Rozhenko. She thinks the only option is destroy the IKS T’Ong, but there may be another way.

I summarize the plot and point out and explain all the references so you don’t have to.