Superboy Vol 1 #083

When a youthful criminal and his dog gain the powers of Green Kryptonite radiation from passing through a green space-cloud, they come to Earth and endanger Superboy and Krypto with their radiation and their abilities to transform anything they touch into Kryptonite. But Mr. Mxyzptlk appears and, rather than see his old enemies destroyed by someone else, teleports the Kryptonite Kid and Kryptonite Dog away, restores the objects turned into Kryptonite to their former natures, and then vanishes. This comic is in poor shape: .3-1.0