Chapter 14: The Tragedy - S2-E6
Other mistake: Ahsoka tells Mando the name of a planet. Just the name and nothing else, we see him take off. It's a rather big planet as we can see from the atmosphere, and the Jedi temple is secret...yet Mando right away just finds "the big rock" in a planet with a complex sorta Earth-like geography.
Answer: In (non-canon) Legends, Thrawn was the central character of a trilogy of novels by Timothy Zahn. He was a Chiss officer in the Imperial Navy, who rose to the rank of grand admiral despite being non-human. Thrawn was brought into canon in the Star Wars Rebels series, where he commanded the Empire's Seventh Fleet and led the occupation of Lothal, which was opposed by the series' protagonists including Ahsoka Tano. In the final episode of Rebels, the Jedi and Rebel Ezra Bridger commands Purrgil space whales to drag Thrawn's Star Destroyer into hyperspace, jumping to an unknown location with himself and Thrawn on board. The final scene of the series shows Ahsoka Tano and Sabine Wren leaving Lothal to search for Bridger, and presumably Thrawn.
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