Six different couples, on the verge of marriage. One partner is ready to get married, the other isn’t quite as sure. An ultimatum is issued - and in just over eight weeks, they must commit to marriage, or move on. In the meantime, each will choose a new potential partner from one of the other couples, in a life-changing opportunity to get a glimpse of two different possible futures. The series is hosted by Nick and Vanessa Lachey.