“Batman's Master”
Batman battles a renegade scientist using a Batman robot, which is damaged during the battle. Soon after, the mysterious Kadar appears on the scene, a mystic who knows Batman's every thought and plan.
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Batman #138 (1940) is issue #138 of DC's Batman (1940–2011), with a cover date of March 1961. Written by Henry Boltinoff and Bill Finger and drawn by Henry Boltinoff and Sheldon Moldoff.
Credits, characters and story details from the Grand Comics Database, CC BY-SA 4.0.