'NCIS: Los Angeles' season 7 episode 17 spoilers: Sam's family threatened; agent's ex-lover Jada Khaled returns

It is Callen's turn to stand by his friend as Sam's family is threatened by unknown individuals.
One of the main reasons why "NCIS" and its spinoff shows have millions of fans is its emphasis on the idea that family, whether they're the biological kind or not, will always be there. That was clearly seen in Sam's (LL Cool J) support of Callen (Chris O'Donnell) in episode 16, and it will be manifested again in the upcoming episode of "NCIS: Los Angeles" season 7.
G. Callen finally found out what the "G" in his name really means in "Matryoshka, Part 2." After 7 seasons, the "NCIS" agent and the show's numerous fans were blown away with the revelation of who Callen's father really is and that his real name is actually Grisha Alexandrovich Nikolaev. It was a crucial moment that wouldn't have happened without Sam's support.
Callen will be returning the favour in episode 17. A synopsis for the episode, titled "Revenge Deferred," revealed that "extensive surveillance footage of Sam's family is found in Africa, prompting the dup to fly out to find out who is responsible and why.
A trailer for the episode shows how far Sam will go to protect his family. The short clip begins with a soldier telling Sam that what he's about to see is "for your eyes only." The former Navy Seal is then shown a board full of surveillance photos of his wife and kids. Callen and Sam are then shown interrogating a man in a narrow corridor but the suspect maintains a blank face. There's a scene of Sam throwing him against the wall and Hetty (Linda Hunt) ordering the two back in the office. As Callen explains the situation, fans can see Kensi (Daniela Ruah) and Deeks (Eric Christian Olsen) looking concerned and Sam stabbing someone. The clip ends with Hetty saying she's willing to let Sam hate her if it means he will remain alive.
The episode's title is intriguing as "Revenge Deferred" could pertain to Sam or the suspect, but it is currently unclear who it might be. Some have speculated the suspect to be either Jada Khaled (Ella Thomas) or her brother, Tahir (Anslem Richardson). Jada fell in love with Sam when he worked undercover to gain information on Tahir and felt betrayed when the agent revealed the truth to her.
It's unclear who's really after Sam's family and it remains to be seen if Sam will be able to protect them. But how far will he go to stop those who plan on harming them?
"NCIS: Los Angeles" season 7 episode 17 is set to be aired on CBS on Feb. 29.