Strok, a blue-eyed, blond-haired Human male, served as an Imperial officer working under High General Touno's command in the southern sector of the planet Svivren. He was secretly a double agent, working for both Black Sun and Black Nebula. During Mara Jade's raid on Svivren, which aimed to seize Black Nebula's leader, Dequc, Captain Strok relayed intelligence to Dequc, allowing him to be substituted by a double. Strok then staged his own demise during the conflict and fled to Nezmi alongside Dequc.
Subsequently, inside the Nebula's base at the Bubble Cliffs, Jade killed him after each recognized the other.