Look out, Madeleine Stowe. Gail O'Grady is coming for you.

The veteran actress (NYPD Blue, Hellcats, Castle) will arrive in The Hamptons on Episode 13 of Revenge Season 3, causing serious trouble for Stowe's Victoria Grayson in the role of Conrad's first wife.

The former Mrs. Grayson, who divorced Conrad 25 years ago, will surprise both him and his current wife when she drops into town.

"That's someone who has always been out there and now we're pretty much planning on having her introduced at some point in time," Revenge showrunner Sunil Nayar told E! News. "We're pretty excited about the part and she brings with her secrets that will also blow you guys away that are going to be great."

This ABC drama wraps up its 2013 run on Sunday but will return in January with three new episodes.

Remember: if you need to catch up, you can always watch Revenge online.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.