Here’s a snippet of Michael Shanks’ interview with Jenna Busch with The Huffington Post:

OK, I have to jump right in to your guest appearance as Hawkman on Smallville because everyone is freaking out about it. I know you can’t tell me a lot, but what can you tell me?
Shanks: Well, I think the cat’s out of the proverbial bag, but a few characters from the Justice Society are showing up in Smallville this season, in an episode which has now been turned into a two-parter. “Society” is directed by Glen Winter, and the second part, “Legends” is directed by Tom Welling. And both written by Geoff Johns, who is the famous comic book writer who also gave rebirth in the DC Universe to the character I’m playing, Hawkman. So what can I tell you about the plot line? Hmm.

I know you can’t reveal much…
Shanks: Let’s just say that a few of the Justice Society characters have come out of retirement to meet up with an old foe and happen to cross paths with Clark (Tom Welling) and some of the characters from the Justice League. And let’s just say there are some misunderstandings.

Read the full interview here.