Desmond Harrington will reprise his role as Chuck's Uncle Jack on Gossip Girl later this season.

The Dexter cast member made a brief appearance of sorts in Gossip Girl's fall finale when Jack’s voice was heard on the other end of a phone call with Diana (Elizabeth Hurley), revealing a connection to her for the first time.

This spring, Bart's brother will return in person, and this won't be a one-off cameo either.

“He’ll be back for the last third of the season,” executive producer Safran reveals, and fans will likely enjoy seeing Jack and his nephew on the same side. “When Jack returns, he and Chuck are on good terms."

"This time around their story is more of a fun story than an antagonistic story. It’s really twisty and comic. And there might even be some secrets that Jack will help Chuck to uncover.”

Gossip Girl returns from its holiday hiatus next Monday with "The End of the Affair." The following week, "Father and the Bride" airs, followed by the 100th episode on January 30, entitled "G.G."

Are you excited to see Jack back? What's his connection to Diana? Sound off below!

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.