SUPERMAN'S THREE MISTAKES Clark Kent gets an anonymous letter telling him to research his past to find mistakes that gave away his secret identity. MR. MXYZTPLK'S SECRET IDENTITY To frustrate Superman from sending him back to his own dimension, Mr. Mxyzptlk adopts a secret identity. SUPERMAN, SLAVE Clark Kent is accidentally thrown from an airplane into a hidden valley ruled by a medieval tyrant named Eldric. In order to overthrow him, Superman pretends to be his slave.
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