Adventure Comics #500

In "The Secret of the Mystery Legionnaire!", the Legion of Super-Heroes welcomes a new recruit—Legionnaire Lemon, or Marvel Lad—whose true identity as Mon-El is finally revealed, unlocking his full potential after being cured of his long-standing weakness to lead and freeing him from the Phantom Zone.

In "The Secret Power of the Mystery Super-Hero!", Element Lad, the last survivor of the destroyed planet Trom, joins the Legion of Super-Heroes under the alias Mystery Lad to hide his ability to manipulate elements. Now hunted by the space pirate Roxxas, who slaughtered his people, he must balance his desire for secrecy with the need to protect the galaxy—without revealing the truth of who he really is.

In "Part II: Last Stand of the Legion!" from Adventure Comics #500, Mask Man’s deadly assault on the Legion of Super-Heroes reaches its climax when his true identity is revealed—uncovering a shocking connection to the mischievous Mr. Mxyzptlk’s 30th-century lineage. Superboy must face this twisted heir to the prankster’s legacy in a final battle that tests not just strength, but the very nature of legacy and magic.

In "The World of Doomed Olsens!", Jimmy finds himself whisked to the surreal world of Gion-El, where he encounters endless versions of himself—each trapped in a form he once transformed into. As the illusion begins to unravel, the Legionnaires step in to reveal the truth behind the test, leading Jimmy toward a moment that will define his place among the stars.

In "Part I: The Condemned Legionnaires!", a mysterious Crimson Virus strikes the girl Legionnaires, leaving them vulnerable and isolated. When Satan Girl attempts to usurp their place, her betrayal sparks a dangerous confrontation—just as Supergirl arrives on the scene, drawn into the unfolding crisis.