As Christmas and a new year approaches, NCIS fans have a possible love interest for Gibbs to look forward to.

But what about developments on the West Coast?

Shane Brennan, who produces NCIS and its highly-rated spinoff, says viewers can expect “a shocking arc with a massive twist” in early 2010. This development will reportedly involve LL Cool J’s Sam Hanna and not be resolved until May.

“It will involve a man from his past,” Brennan told TV Guide Magazine, offering few other spoilers regarding the storyline.

Also ahead on NCIS: Los Angeles:

• Callen reopening a cold case that will reunite him with a ex;
• Kensi Blye will reveal something about her heretofore unseen father.

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