X-O Manowar / Iron Man: In Heavy Metal

In this 1996 one-shot from Acclaim/Valiant, writer Fabian Nicieza and artist Andy Smith bring together two armored icons for a crossover that pits X-O Manowar against Iron Man. The story leverages the shared "heavy metal" theme of their high-tech suits, offering a clash of personalities and technology between the Visigoth warrior and the billionaire inventor. Though a single issue, it stands as a notable meeting of Valiant and Marvel universes during the era.