Were you surprised to see Sean and Leila reunite on this week's episode of The Event? That development took our critic aback, as you can read her full take on "Casualties of War" HERE.

How will this NBC drama shock us next week? According to the preview below, the President will have a major decision to make regarding Sophia, while the following developments are also set to take place:

• Sean meets up a conspiracy theorist.
• Simon must choose between the detainees and Sterling's team.
• The President's deal with Thomas is threatened by a traitor.

Watch the preview for "Loyalty" now:

[video url="http://www.tvfanatic.com/videos/loyalty-preview/" title="Loyalty Preview"] [/video]

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