Samar might be the mole in "The Blacklist" Season 4. "Lost" actor Terry O' Quinn will play the role Tom Keen's father in the "Blacklist" spin-off series "The Blacklist: Redemption."

During the series' midseason finale, James Spader's Red found out that there is a mole in the Federal Bureau of Investigations (FBI) . This rises speculation that Mozhan Marno's Samar is an agent set on infiltrating the FBI.

iTech Post reported that this speculation is supported by the 9^th preview episode called "Lipet's Seafood Company." In the preview, Harry Lenix's Harold is seen telling the mole "You must quickly decide where your loyalty lies." The site said that it seems like only Red and Harold knows who is the mole in "The Blacklist" Season 4.

Of course, Elizabeth Keen, played by Megan Boone, would not rest until she finds the mole. According to the site, she will take matters into her own hands until she founds a lead that will reveal who the mole in "The Blacklist" Season 4.

Since Samar's appearance, her past has always been in question. Little is known to her past aside from the fact that she was a Mossad Agent from Iran.

Despite this, there has been no confirmation if Samar is the mole. "Blacklist" fans would have to watch out if Samar really is the mole. Aside from Samar, Diego Klattenhoff's Ressler and Amir Arison's Samar were also suspected as moles by fans.

Speaking of "The Blacklist," Terry O' Quinn from the hit series "Lost" is slated to play as Tom Keen's father in "The Blacklist: Redemption." TVLine reported that O'Quinn will play opposite Famke Jensen, who will play Howard's wife Scottie.

Howard is the found of Halcyon Aegies, a private military firm where Tom works. Jobs & Hire reported "The Blacklist" Season 4 will return on January 5, 2017, while, "The Blacklist: Redemption" will premiere in February 23.