The Halk Kar plot was reused in "Superboy" #89 (June 1961), in a story set during Superman's career as Superboy, one that simply disregarded the history outlined in the original (a practice common at the time). The character's name was changed to Lar Gand, his homeworld was changed to Daxam, and he was made younger to roughly match Superboy's age. He was an explorer who had landed on Krypton, where Jor-El warned him of the planet's imminent destruction and gave him a map to Earth. He suffered amnesia upon landing on Earth, where he met Superboy. As he gained powers like Superboy, the hero concluded that he was a long-lost brother, and named him Mon-El: "Mon" because he landed on Earth on a Monday, and "El" for Superboy's own Kryptonian family name (although in 1964, Bob Rozakis wrote a letter to "Adventure Comics" in which he pointed out the existence of the alloy monel "which had characteristics similar to the hero of the same name"). He adopted a human secret identity (Bob Cobb) to integrate into Superboy's hometown of Smallville.