According to ComicBook.com (h/t BleedingCool), Man of Steel, Smallville and Arrow alum Mark Gibbon will appear in the Season 2 finale as General Zod, though it remains unclear in what capacity.
Kneel before Zod, as a Man of Steel alum may have joined the cast for Season 2.
In Man of Steel, Gibbon played one of the oil rig workers rescued by Henry Cavill’s Clark.
Supergirl has gotten a bit more flexible in its second season, freely introducing its own Superman (and maybe Lex), and now one of the other great Super-foes is reportedly inbound.