Two new relationship experts join Dr. Pepper Schwartz to select three compatible couples for another round of the marriage experiment.
The six singles selected for the controversial social experiment meet their matches and make plans for their upcoming weddings.
The six singles take the plunge and say "I do"; Heather hopes that Derek will meet her expectations; Sonia is attracted to her new husband, Nick; rain threatens to wash away Lillian's dream of the perfect wedding.
Relationship expert Rachel DeAlto gives advice to each couple before they head off on their honeymoons; Sonia and Nick attempt to overcome their insecurities; Heather and Derek learn about each other's habits; Tom hides a secret from Lillian.
The three couples begin their honeymoons; Lillian and Tom take their relationship to the next level; Sonia misinterprets Nick's intentions; Heather has concerns about Derek.
Tom worries about the secret he is keeping from his new wife, Lillian; Nick and Sonia discover each other's competitive spirit; new conflicts threaten Heather and Derek's relationship.
The couples must decide where they want to live; Lillian learns that Tom lives in a bus; Sonia is afraid of her husband's dogs; Pastor Calvin Roberson sits down with Heather and Derek, whose marriage is beginning to crumble.
Tom and Lillian disagree on the subject of having children; Sonia and Nick struggle with their communication skills; Derek and Heather must decide if it is time to end their marriage.
Rachel DeAlto helps guide Tom and Lillian toward a healthy relationship; Sonia and Nick hope that a tantric healer can help jump-start their intimacy; Derek and Heather continue to struggle.
Lillian attempts to make Tom's birthday a memorable occasion; Derek and Heather reflect on their journey; Nick feels pressured by Sonia.
The couples tackle issues head-on as their relationships grow; Sonia and Nick reveal a big secret; Lillian worries about her future with Tom; Derek and Heather remember the good times.
The three married couples learn about the importance of trust in their relationships.
The couples attempt to get along with their in-laws when they spend Mother's Day with each other's families.
Dr. Pepper sends the couples on a second honeymoon in a final attempt to strengthen the marriages into lasting relationships.
As the six-week experiment comes to a close, each of the couples must decide whether to remain married or opt for a divorce.