The latest episode preview clip for the Disney XD show “Star Wars Rebels” shows Grand Admiral Thrawn getting one step closer to tracking down the rebellious traitor, known as Fulcrum, in the episode “Through Imperial Eyes.” To aid in his efforts, Thrawn has enlisted the help of Colonel Wullf Yularen, the former of mentor of Kallus, Imperial agent -- and the spy in question.

Wullf Yularen has had a long history in the “Star Wars” canon. As a former admiral, he worked with the Republic during the Clone Wars, even commanding a Jedi Cruiser alongside Anakin Skywalker. When the Republic crumbled, giving way to the Empire, Yularen made the transition, too, becoming a member of the Imperial Security Bureau. As a member of the Bureau, Yularen works to ferret out dissent in the Imperial ranks.

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By inviting Yularen to help reveal the identity of the spy Fulcrum, Thrawn has put Kallus in a dangerous spot. The punishment for treason in the Empire is, after all, not a pleasant one.

“Star Wars Rebels” recounts the slow decline of the Galactic Republic in the wake of the Empire’s rise, and the subsequent fermenting rebellion. Taking place 14 years after the “Star Wars: Episode III – Revenge of the Sith” and five years before “Star Wars: Episode IV – A New Hope,” the series brings together a ragtag group of rebels who conduct covert operations against Imperial forces.

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The “Star Wars Rebels” episode “Through Imperial Eyes” airs on Disney XD this Saturday, February 25 at 8:30 p.m.