The first two couples paired up by the relationship experts meet at the altar for their wedding ceremonies. Will romantic sparks fly when they lock eyes for the first time, or could doubts creep in?

Another two couples experience a very unusual first date - their own wedding! One bride's feeling daunted but the final pair experience instant attraction. And all four couples go on their honeymoons.

The heat is turned up on the pressure-cooker relationships as the newlyweds move in together and begin to experience everyday married life. How will they fare in their first few days as Mr and Mrs?

The experiment has reached its halfway stage and an intimate dinner party in Sydney provides the first opportunity for the four couples to meet and compare how their relationships are working out.

With one week to go until the newlyweds have to make their big decision, some of the couples manage to visit the in-laws, improve communication and strengthen relationships but one pair are struggling.

The social experiment is over and the relationship experts gather to hear the couples make one of the biggest decisions of their lives. Will the participants opt to stay married or ask for a divorce?