This Sunday, December 1, will see the 250th episode of NCIS: L.A. and it deals with one of the most popular members of the team. We are - of course - talking about "Hetty" (Linda Hunt, 74). The Operational Manager is visited by a former protégé who is seeking revenge.

"Akhos Laos" (Carl Beukes, 43) is an undercover agent  who was apparently hired and trained by "Hetty" years ago. However, he is anything but satisfied with the life that "Hetty" introduced him to.

"Akhos Laos" wants to exact vengeance on the long-time NCIS: L.A. agent, because she once gave him the job that now makes life difficult for him. It looks like "Hetty" could be in real danger if he puts his plan into action.

The 250th episode of NCIS: L.A. is titled "Mother" and was actually co-written by one of Linda Hunt's co-stars. "Deeks" (Eric Christian Olsen, 42) was in fact on double duty for this episode: actor and writer.

Many fans hope that the visitor from "Hetty's" past will give everyone better insight into her background. Before she joined the NCIS team in Los Angeles, she was working for the CIA.

NCIS: L.A.: "Hetty" used to work for the CIA

"Hetty" got her degree in computer science and then for a time worked for the L.A. field office of the CIA. This is probably where she first encountered "Akhos Laos", who is now after her.

Episode 250 of NCIS: Los Angeles Season 11 airs Sundays at 9 p.m. (8 central) on CBS.