The Stalker-class was a type of starship design in use by the Klingon Empire in the 23rd century.
In 2272, several Stalker-class ships were among the Klingon vessels assimilated by the Borg, who were manipulated by the rogue Vulcan scientist T'Uerell while she was allied with the Klingons. These assimilated Klingon ships engaged Starfleet in battle, during Admiral James T. Kirk's efforts to thwart T'Uerell's plans, and were destroyed. (ST video game: Legacy)