Kai Blue was Journey Blue's brother and co-pilot in the Combined Galactic Resistance against the Daleks. He was critically wounded and unconscious when first seen, while Journey was desperately attempting to both keep him alive and outrun a pursuing Dalek ship. He was then killed when the Daleks managed to land a direct hit on their ship, but Journey survived when the Twelfth Doctor's TARDIS materialised around her. She turned a gun on him, angry, shouting that her brother had just died. (TV: Into the Dalek)

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