In this extended opening episode, the brides and grooms enjoy one last night of freedom at their stag and hen parties. The drama kicks off early when one groom's controversial opinion leaves everyone questioning whether he's there for the right reasons.

Four more singles enter the experiment, and there's an instant and undeniable attraction for one couple, but could another bride's dreams of a fairytale wedding be crushed when her groom makes the ultimate wedding day blunder?

The first four couples embark on romantic honeymoons, giving them the first opportunity to really get to know each other after the extraordinary excitement of their wedding days.

Two more couples take the ultimate leap of faith, and one couple discover they have an immediate connection, but will the bride's traditional values put a dampener on their wedding night?

The last four singles finally get to walk down the aisle, but an overcurious bride with a long list of questions might prove too much for one groom to handle.

Our last newly-wed couples jet off on their honeymoons. Love blossoms for some but others begin to feel the strain, and one bride is pushed to breaking point.

The newlyweds settle into their new homes and come together for their first dinner party, but one groom's behaviour shocks the group and forces his wife to question her new husband.

The couples face the experts at their first Commitment Ceremony, and while some take the opportunity to celebrate, others must make a life-changing decision.

Experts Week sees Mel, Paul and Charlene set exercises specifically designed to strengthen and develop each couple's marriage. However, an ill-judged honeymoon comment comes back to haunt one groom, while the challenge of facing uncomfortable truths proves too much for a marriage that's already on the rocks.

The couples take their seats at the second dinner party. One partner is left wondering if their spouse will even show up, while the honesty box exposes cracks in another marriage. However, rumours about one bride's behaviour behind closed doors spark the biggest conflict of the evening.

Mel, Charlene and Paul invite the couples to the couch for the second Commitment Ceremony of the experiment. Some reflect on a positive week, but others struggle to overcome feelings of betrayal. Another marriage is rocked by a lack of attraction, forcing them to face the tough decision of whether to stay and work at their marriage, or leave the process - and each other - for good.

It's the start of In-Laws Week, and a careless comment leaves one wife's mother in tears when the family come to visit. Plus, a brand-new couple join the experiment! Hoping to find her fairy-tale happy-ever-after, a new bride is in search of her very own Prince Charming - but will his grand efforts to woo her succeed?

As two new singles meet and marry at the altar, a bride hopes to find a man who can handle her, while her groom prepares to drop a bombshell of a revelation.

More of the married couples' loved ones visit for In-Laws Week, but one husband receives a damning review, while another new pair join the search for love.

The fresh batch of newlyweds jet off on glamorous honeymoons and while it's all sunshine and smiles for some, a huge breach of trust leaves one couple's marriage in the balance.

The three new couples make a surprise entrance at the dinner party, sparking friction between one husband and wife.

At the Commitment Ceremony, some marriages flourish, but others begin to wither in front of the group. Will anyone decide to walk away from the experiment, and their partner, for good?

The couples head off for a relaxing countryside retreat, but rumours start to swirl about one of the women, who finds herself at the eye of a storm.

On the second day of the retreat, the husbands and wives spend time apart on separate group days out, but things turn sour when several of the women confront another bride.

The couples mark their final day at the retreat with a dinner party, but events from the previous days out have led to friction within the group and trouble among some of the pairs.

The couples come together with the experts at the Commitment Ceremony. While love is in the air for some, a shock revelation sends the group reeling, putting more than one marriage on the line and leading to a tense, nail-biting showdown in the most dramatic ceremony of the series.

It's Love/Hate Week, and the experts challenge the couples to list what they like and don't like about each other. While some grow stronger, others struggle.

The newlyweds head off on days out, but rest and relaxation are the last things on their minds. Things get spicy on the dance floor and steamy in the hot tub, as a potentially compromising photo stirs up trouble. Plus, a blindsided groom is ambushed by two brides who are determined to give him a piece of their minds.

It's Dinner Party time, and the aftermath of the big days out creates tension. Two husbands clash when one of them tries to defend his wife's honour, and a dinner table disagreement sends another couple on a downward spiral. However, it's a surprise arrival that delivers the biggest shock of the evening.

Mel, Paul and Charlene offer their expertise at the penultimate Commitment Ceremony, with one couple having to confront difficult truths as their future is called into question.

Following an emotional Commitment Ceremony, the remaining couples face the most challenging task of the series so far - Partner Swap Week.

The penultimate Dinner Party packs an emotional punch when anonymous letters compel every couple to face their problems head-on, and tensions rise as two of the group clash.

The homestays get underway, and while one couple get an unexpectedly warm welcome from the mother-in-law, it's far from home-sweet-home for another husband and wife.

The problems between one husband and wife worsen, close family ties put strain on another marriage, and probing questions from friends lead to an explosive argument.

Following an eventful time at homestays, the remaining couples face the final Commitment Ceremony, seeking guidance from the experts one last time.

It's a crucial moment for the remaining couples as they embark on their final dates, which offer a chance to reflect on their journey through the experiment.

The couples spend time apart on boys' and girls' nights out, as they welcome back the husbands and wives who have left the experiment.

The remaining couples gather for their last dinner party together and when allegations and accusations start to fly, one couple reach breaking point.

As the experiment draws to a close, the remaining couples move out of the apartments and prepare for Vow Renewals.

The group reunite for the first time since the experiment ended for one final dinner party, where they find out which marriages have flourished in the outside world and which ones didn't withstand the pressure.

Series nine concludes with the final Reunion Ceremony, a last chance for the group to meet with experts and look back on their time in the experiment.