Alexsandr Kallus was a human agent of the Imperial Security Bureau, designated ISB-021, who became one of the Rebellion's most valuable spies. Born on Coruscant and trained at the Royal Imperial Academy under Wullf Yularen, he rose to the rank of agent and captain, suppressing dissent on worlds such as Onderon and Lasan and hunting the rebel crew of the Ghost on Lothal.
Stranded alongside the Lasat warrior Garazeb Orrelios on the moon of Bahryn, Kallus came to question his loyalties and secretly became a rebel informant under the codename Fulcrum. After Grand Admiral Thrawn exposed him, he escaped Imperial custody during the Battle of Atollon and joined the Rebellion openly, later aiding the liberation of Lothal. His arc unfolds across Star Wars Rebels.
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