“For eight years, Arrow has stood on the shoulders of Smallville. Simply put, there would be no Arrow, and no Arrowverse, without it,” crossover executive producer Marc Guggenheim said in a statement. “So when we first started talking about Crisis on Infinite Earths, our first, second and third priorities were getting Tom to reprise his iconic role as Clark Kent. To say that we’re thrilled would be a Superman-sized understatement.”

Tom Welling Will Be Smallville’s Clark Kent Again For The Arrowverse’s ‘Crisis On Infinite Earths’
Great news for both Arrowverse and Smallville fans. Tom Welling is joining the Crisis on Infinite Earths crossover.

Now bring Lex back too.
Doubht Chloe will make it though lol