“Half a Superman!”
Red Kryptonite particles in a comet cause Superman's left side, and Krypto's right side, to become vulnerable; unfortunately, it's on a day when Lois wants to prove that Superman is really Clark.
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Action Comics #290 (1938) is issue #290 of DC's Action Comics (1938–2011), with a cover date of July 1962. Written by Henry Boltinoff and Jerry Siegel and drawn by Henry Boltinoff, Jim Mooney and Curt Swan.
Credits, characters and story details from the Grand Comics Database, CC BY-SA 4.0.