We meet our 4 couples,#1 Diandra and Connor, #2 Maggie and Carson, #3 Dallas and Sincere, #4 Caroline and Sawyer--Each couple is dealing with issues that are tearing their marriage apart, from grief, to judgement, overly competitive natures, dishonesty, to insecurity and doubt. They embark on a social test called The Experiment and are promised a chance at healing their marriages but have no idea what to expect.

Each couple meets their new spouse. Diandra is now with Dallas, Connor with Sincere, Maggie with Sawyer, and Caroline with Carson. Tension all around as each person brings a different level of openess, insecurity and vulnerability to the process. Diandra tries too hard and Dallas is withdrawn. Maggie doesn't beleive Sawyer has anything to offer and is insecure with how phyically perfect he is, Sawyer is young and carefree and sees Maggie as wallowing in her own self doubt. Caroline and Carson open up to each other but both quickly retreat when he compares her to his "real wife". Sincere has guilt about even being there whe she and Connor share a moment.

Now fully immersed into the experiment, the couples try to make the most of the process but the deeper they go the more their traditional values and the vows they took with their original spouses, conflict. Carson and Caroline clash over control in their relationship. Maggie can't shake her self pity and deflects her issues onto Sawyer. Diandra and Dallas let their guard down but guilt over their ability to be free together creeps in. Connor and Sincere and Connor clash over insecuritites relating to both their pasts.

Things begin to heat up for the participants, as they realize they were paired with the person who can give them exactly what they need at this point in their lives, blurring their oriiginal matrimonial lines even further. After an emotional stability test within the experiment, Sincere and Connor get closer but her commitment to Dallas is a conflict for both of them. Caroline and Carson share a moment but how far will they actually go? Maggie and Sawyer find a common place but is their relationship based in reality or the bubble of the experiment? After a series of emotional stops and starts have Diandra and Dallas hit their stride?

It's the Final Day of the Experiment with the new spouses. Time for the participants to leave it all on the table before going back to their original spouses. Can Sincere lose herself enough to break her vow to Dallas? Will Dallas be able to keep his integrity if he gives into Diandra? Are Maggie's demons too much for her to be with Sawyer outside of the experiment? How do Carson and Caroline say goodbye after all they've been through?

After having the ultimate experience with their experiment significant, the participants return home to an awkward reunion with their original spouses, and all must decide if they are going to stay together or not.

After the dramatic reveal of their choices to stay or leave, the participants of The Experiment attempt to process the new lives they now face. But The Experiment isn't done with them just yet.

Each participant seriously considers their options when The Experiment offers them a 3-day reprieve, but they only have 24 hours to decide.

When The Experiment drops off the individuals taking advantage of the 3-day reprieve in an undisclosed location, they soon rediscover the reasons they fell in love and are forced to confront the ugly truths tearing them apart.

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Having made their final decisions, the participants begin to move on with their lives only to be brought back into The Experiment by a common dark force that connects them all in a mysterious way.

A new face enters the fold amidst flashbacks and flash-forwards of the participants complicated relationships with each other.

Sawyer finally chooses between Caroline and Maggie. Carson comes across information about The Experiment that sends him deeper into his downward spiral.

Maggie is showing signs of a behavior that Sawyer doesn’t know what to make of. Carson is on the brink of losing his mind.

Diandra meets someone new, and it’s electric. The Experiment offers Sawyer information that will shake his relationship with Maggie to the core.

Connor is closing in on Harvey, but what part of himself will he have to lose when he finds him? Carson has found meaning in his life, but is he truly over Maggie?

Dark pasts and twisted secrets come to light as each couple finally makes the choice whether to stay together or leave their original spouses.

In the aftermath of the shooting, the couples gather in shock at a local Las Vegas hospital, reeling from the events that took place as one life hangs in the balance.