“The Simpleton of Steel!”
Red kryptonite causes Superboy to grow an extra finger on each hand, however he pretends it has made him a simpleton in order to catch some crooks.
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Superboy #105 (1949) is issue #105 of DC's Superboy (1949–1977), with a cover date of June 1963. Written by Henry Boltinoff and Jerry Siegel and drawn by Henry Boltinoff, George Papp, Al Plastino and others. It has the first appearance of Swifty.
Credits, characters and story details from the Grand Comics Database, CC BY-SA 4.0.