The Ekosian ship was a type of spacecraft with interplanetary capability from the planet Ekos.
In 2268, one of these ships was a member of a space fleet of manned and unmanned weapons sent on a mission of conquest against the neighboring planet Zeon. Aboard the ship, there were friends, many of them belonging to the Underground, of Isak. When the mission was aborted, the ship returned to its base on Ekos. (TOS: "Patterns of Force")