Adventure Comics #307

In "The Confession of Superboy!", Superboy faces a rare challenge when Lana Lang unwittingly exposes him to Red Kryptonite, stripping him of his voice—yet he still fights to protect his Clark Kent identity. Meanwhile, the Legion of Super-Heroes welcomes new member Mystery Lad, who aids them in thwarting the menace of space pirate Roxxas. Written by Edmond Hamilton and illustrated by John Forte, with covers by Curt Swan and George Klein, this 1963 adventure blends personal vulnerability with interstellar action.