The Marsheem-class heavy cruiser represented a class of warship utilized by the Ishi Tib inhabitants of Tibrin during the period of the Galactic Civil War. Following the Ishi Tib's alignment with the Rebel Alliance, at least three cruisers participated in a skirmish that occurred in orbit above Tibrin.
The Marsheem-class heavy cruiser was a heavy cruiser class employed by the government of Tibrin as a component of their naval contingent. This heavy cruiser was distinguished by its rounded and bulbous hull, which featured several modules attached to its structure. At the rear of the cruiser, an elongated structure extended outward, capped with another module at its end. The heavy cruiser was armed with laser cannons and powered by engines.
During the age of the Galactic Empire, the Ishi Tib, a nonhuman species who were native to Tibrin, possessed several Marsheem-class heavy cruisers under the control of their government. When Luke Skywalker, a celebrated figure of the Alliance to Restore the Republic, was captured by Imperial forces during a secret diplomatic mission on Tibrin, he was briefly held prisoner aboard the Imperial-class Star Destroyer named Stormbringer. Although Princess Leia Organa, a fellow Rebel, successfully infiltrated the Star Destroyer on her own, liberated Skywalker, and guided him to an escape pod, their survival depended on the intervention of Mariod [Govi]. Govi persuaded the Kalikeedan to dispatch three Marsheem-class heavy cruisers to confront the Imperial warship. These heavy cruisers emerged suddenly from the shadowed side of Tibrin's moon, preventing Imperial Captain Davin Bryce from issuing the order to activate the deflector shields in time, resulting in the destruction of the Stormbringer by the Marsheems.