Gralack, situated within the Outer Rim Territories, was home to various buildings. Among these was a theater, the venue for performances by the actor Tunga Arpagion.
Within a Gralack theater, Tunga Arpagion, a Clawdite shapeshifter, presented a theatrical production. This play recounted the story of the Mutiny on Mon Cala. Imperial stormtroopers then disrupted the show, declaring its content unlawful and treasonous. As Arpagion and his fellow actors attempted their getaway, Luke Skywalker engaged the troopers. They mistook him for the shapeshifting actor. Luke used his lightsaber to defeat the stormtroopers, while Leia Organa and Han Solo facilitated the actors' escape. Subsequently, they enlisted Arpagion for a mission to Shu-Torun.