Caleb Dume, better known to Star Wars Rebels fans as Kanan Jarrus, and his master Depa Billaba (who first appeared in Star Wars: The Phantom Menace) experience Order 66 in the opening moments of this episode. This event was first explored in the Marvel Comics series Kanan: The Last Padawan, written by Star Wars Rebels executive producer Greg Weisman. Its depiction here takes some cues from the comic, including the planet of Kaller and an appearance by clone trooper Grey.

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