In the Name of the Rebellion Part 1.Ezra, Kanan and Sabine arrive on Yavin 4 to join the main group of the Rebel Alliance. Hera's squadron also arrives, having barely survived an Imperial ambush, which Bail Organa attributes to an Imperial communications relay on Jalindi. A droid projects a hologram of Saw Gerrera, who mocks Mon Mothma for her unwillingness to go to any lengths to defeat the Empire, and Mothma angrily responds, refusing to stoop to the violence and extremism committed by Gerrera's cell. She sends the Ghost crew on a mission to intercept the relay's transmissions. Sabine inadvertently connects them to the main channel on an approaching light cruiser, forcing Ezra to impersonate an Imperial officer—unfortunately it is the very officer who is commanding the cruiser, Brom Titus. Sabine calls for Hera to pick them up, as they have been seen. Before she can do so, a U-Wing piloted by Gerrera arrives, picks up Ezra and Sabine, then bombs the relay dish, destroying it and the cruiser. Hera demands Gerrera transfer Ezra and Sabine, but he jumps into hyperspace. Gerrera convinces Ezra and Sabine to aid him in discovering the secret weapon he is convinced the Empire is working on. They board an Imperial cargo shuttle disguised as a regular civilian spacecraft, and discover a group of prisoner engineers from the planet Coruscant who are being shipped to Jedha for an apparent project. Gerrera insists that this is more evidence of a secret weapon. They also find a giant kyber crystal, which they plan to haul out of there with the prisoners. Chopper attempts to get the prisoners out of harm's way via escape pod, though they are stopped by the Empire. When the plans to get the crystal off of the ship fail, Gerrera blasts it so that it will explode. He calls Two-Tubes to pick him up, and Ezra and Sabine are rescued by the Ghost crew after destroying a massive Star Destroyer. The engineers decide they want to join the Rebel cause, and they head back to Yavin IV.