Australia's most controversial social experiment is back. More couples and more pressure than ever. Tonight there's two big weddings, and for the first time the brides and the grooms get together at separate Bucks and Hens nights.

Australia's most controversial social experiment is back. More couples and more pressure than ever. Tonight two weddings and a big secret is revealed that will shock one bride.

Australia's most controversial social experiment is back. More couples and more pressure than ever. Tonight two weddings. Is one groom ready for a culture clash he didn't see coming?

Tonight, Lauren the single Mum looking for love a second time around has a big decision to make and divorced Dad of two, John, faces an emotional day for him and his daughters.

Tonight, it's the final weddings as identical twins Sharon & Michelle walk down the aisle together in the biggest wedding in Married At First Sight history.

Tonight, the runaway bride is confronted for the first time with her jilted husband as the other couples come to terms with married life on their honeymoons.

More couples and more pressure than ever. Tonight, sparks fly at the first weekly dinner party. Who is flirting with who and who storms out?

The first weekly commitment ceremony. Who will choose to stay and who will leave the experiment plus a shocking revelation that will rock everyone.

The couples move into an apartment building together and a twist in the experiment that no one sees coming.

The second dinner party erupts as guards come down and people start to reveal their true feelings.

The fallout from the dinner party rocks the commitment ceremony as the couple have to decide whether to stay or leave the experiment.

The wives face a reality check as they leave their apartments for a homestay back among their husbands' family and friends and not everyone likes what they find.

An emotionally charged commitment ceremony pushes Simon to breaking point as the couples have to decide whether to stay or leave the experiment.

The husbands face the reality of life with their wives as they take on a homestay with their bride's family and friends with some unexpected results.

The remaining couples gather for another emotional Dinner Party fresh from their homestays with Cheryl and Susan confronting an unresolved issue.

Tonight, with their relationship on the rocks will Andrew and Cheryl survive the Commitment Ceremony? And has Anthony gone too far this time.

Tonight, the couples families finally come face to face and what happens at the boys' night that upsets Cheryl.

Tonight, another explosive Dinner Party when Sean breaks ranks and reveals to everyone what really happened at the boys' night.

The final weekly commitment ceremony before the couples face Vow Renewals. Cheryl & Andrew come together after their explosive fallout at the last dinner party. Jesse pours out his heart to Michelle and one high profile couple call it quits.

The remaining couples go on their final dates before the vow renewal ceremonies when they will decide whether or not to leave the experiment together or go their separate ways.

The final dates continue before the vow renewal ceremonies where the remaining couples will decide whether or not to leave the experiment together or go their separate ways.

The final Dinner Party. Each couple comes under scrutiny as they open up in front of the others on the state of their relationships as they head towards their Vow Renewal ceremony.

The remaining brides and grooms return home to deliberate on whether or not to continue with their marriages after the experiment and the first Vow Renewal ceremonies begin.

Tension builds in the lead-up to the remaining vow renewal ceremonies which bring some unexpected results.

The couples who have renewed their vows return home and face the reality of a long distance relationship.

The couples who have renewed their vows come to terms with the reality of a long distance relationship.

The Dinner Party. All 20 participants who joined the experiment come together for one last emotion-charged dinner party.

The participants all face the experts for a confronting look at their journeys over the course of the experiment. Jonesy and the boys are finally played the video of what really happened at Boys' Night.