It's back! Sixteen new singletons, who are looking for love, marry strangers. The brides and grooms celebrate their last night of freedom and the weddings begin.

Four more singletons enter the experiment, for two more magical weddings. One has a fairy-tale feel, but the other turns into an awkward affair.

Our first set of newly-weds jet off on their honeymoons to start married life. Will early buds of love blossom on the beach or will the sun set early on romance?

Wedding bells chime once more, as new couples meet each other for the first time at the altar. While one couple have an instant, electric connection, another bride puts absolutely everything on the line.

Four more single people agree to marry a stranger. While one couple believe their match was written in the stars, the other pair discover that they have worryingly different lifestyles.

The remaining newly-weds head off across the world to enjoy luxurious honeymoons. For some, feelings flourish in the tropical climes, but others start to feel the heat of their marriages, which pushes one couple to breaking point.

The next phase of the experiment begins, as the newly-weds move into their apartments and come together for the very first dinner party. But events take a dramatic turn when emotions run high for the couples who are struggling to find marital bliss.

The couples face the experts at their very first Commitment Ceremony, where they must make a critical decision: whether to stay in the process and continue working on their relationships, or choose to walk away from their marriages for good.

A new chapter begins for all of our newly-weds as the first task of the series is set. Confessions Week is designed by the experts to help the couples open up to each other, but brutal feedback could knock the group's golden couple off their perch.

Mel, Charlene and Paul bring everyone to the couch for the second Commitment Ceremony. Being under the microscope cements some couples' happiness, but for others, the decision of whether to stay or leave the process altogether remains a tough choice.

Four more singles looking for love take the ultimate gamble and join the experiment. Two more weddings lie ahead, but one picky bride has a lot to say about her groom, and an initial lack of spark threatens to overshadow the other couple's happy day.

It's honeymoon time for our freshest newly-weds and Intimacy Week for everyone else. For some it highlights the challenges ahead, while others jump straight in.

The two newest couples return from honeymoon and make a surprise entrance at the third dinner party. But their arrival is overshadowed by rising tensions among the group, as friendships break down and a feud erupts over the dinner table.

The group face the experts on the couch once more at the third Commitment Ceremony. For some, it's an opportunity to celebrate their successes, while others must confront hard truths.

The husbands and wives spend time apart on group days out. But any hopes of bonding quickly unravel, as sparks fly between two brides and uncomfortable questions reveal some big surprises and send shockwaves through the group.

Wedding bells ring again as another couple step into the unknown and join the experiment. Back at the apartments, the married couples open the door to some familiar faces during In-laws Week.

In-laws Week continues, and while home truths give hope to some, chatting with loved ones sends one couple on a downwards spiral. And two grooms tie the knot, but an unexpected twist threatens to ruin the whole celebration.

The final batch of newly-weds head off on their honeymoons, but it's not long before they hit bumps in the road. And In-Laws Week continues, driving one marriage towards breaking point.

The newest couples in the experiment return from honeymoon and unite with the rest of the group. But it's not the welcome they were expecting, as a shock revelation derails the entire evening in the most dramatic dinner party yet.

It's time for the fourth Commitment Ceremony. While some couple celebrate success, others must tackle fundamental issues in their marriages. And under the scruituny of the experst, a bride and groom must face the consequences of their actions.

The couples are tasked with sharing what they like and don't like about each other in Love/Hate Week. While some of them open their hearts, others face brutal criticism. And a video from the past makes one marriage plummet to an all-time low.

The couples head off for a country retreat and spend time apart on girls' and boys' days. Frictions quickly builds between two grooms, while honest opinions upset one bride. And neither group is prepared for the biggest shock of the experiment so far.

On the second day of the couples' retreat, the group reunite for a dinner party. Revelations from the previous day are brought to a head at the table, leading one bride to hit back at the group and throwing another's marriage into turmoil.

Its the penultimate Commitment Ceremony for the couples. Some of the marriages have reached new heights, but others could be nearing the end of the line. And, after shocking scenes, the experts must make a decision that has dramatic consequences.

Following an emotional Commitment Ceremont, the remaining couples face the most challenging task of the series so far: Partner Swap Week. One couple hit a low point, while another groom is left questioning the future of his marriage.

The penultimate dinner party serves up an extra helping of drama, as the anonymous letters force the group to face some uncomfortable truths. And a clash over communication leads to an explosive confrontation between one couple.

The homestays get underway, giving the brides and grooms a taste of life outside the confines of the experiment. But the trip home fails to solve one couple's troubles, and a groom is reunited with some less than friendly faces.

The Homestays continue as the couples try to fit into each other's lives. Some form deeper and stronger connections with their partners, but real-world pressures could be too much for one couple.

After a dramatic round of homestays, it's time for the remaining couples to face their final Commitment Ceremony and garder advice from the experts. While some couples are happy with their progress, others aren't faring as well.

The stakes are high as the remaining couples set off on their final dates. Some of them use the time to reflect and plan their lives outside of the experiment, but for others, the dates serve only to intensify the questions hanging over their future.

It's the final Dinner Party and the last chance for the remaining couples to gather advice from each other before their Vow Renewals. It's an eventful evening, thanks to the daunting return of the Honesty Box, which prompts some shocking truths.

It's Vow Renewals time, and after seeking advice from their nearest and dearest, our couples decide whether or not to embark on their happily ever afters.

At the final Vow Renewals, our last remaining couples decide whether to give their relationships a go outside the experiment, or to walk away for good.

The group reunite for one final dinner party. Old feuds flare up and a shocking rumour is revealed, but which marriages have flourished and which have failed?

In the final reunion ceremony, the group look back on their time in the experiment. And can the experts help one marriage hanging in the balance?