Summary
- Superman '78: The Metal Curtain #1 introduces Metallo as a kryptonite-powered antagonist in the original movie universe.
- The story borrows elements from the 2009 miniseries Superman: Secret Origins, featuring John Corben transforming into Metallo in a kryptonite-powered suit.
- The plot explores themes of military and political tension, with nationalist characters wanting to defeat Superman and achieve supremacy for their respective nations.