Michelle Trachtenberg has booked a ticket to California.

The actress (Gossip Girl, Killing Kennedy) will appear on an upcoming episode of NCIS: Los Angeles Season 5 as a character named Lily, described by CBS sources as an intelligent and witty environmentalist/ private chef.

Look for her to be the victim of a home invasion that “turns her life upside down,” based on the casting description.

“We’re very excited to have Michelle guest on the show,” said executive producer Shane Brennan in a statement. “It’s a very intense episode which pairs Michelle with Callen and Sam, in what is probably one of our biggest action shows so far this season.”

NCIS: Los Angeles has been averaging 14 million total viewers and a 2.4 rating in the advertiser-friendly 18-49-year old demographic this fall.

Trachtenberg's episode will air on December 17.
 

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