All 12 couples face the experts for a final time to look back at their time in the experiment, with some explosive revelations.

All the brides and grooms are back for a giant reunion dinner party.

The remaining couples make their final vows to decide whether or not they want to be together after the experiment.

The remaining couples make their final vows to decide whether or not they want to be together after the experiment.

The final dinner party. The remaining couples face the experts' questions from the Honesty Box.

The final dates continue: the last time the couples will see each other before final vows when they must decide whether or not to continue outside of the experiment.

Girls' and Boys' Nights continue, and the remaining couples go on their final dates before their final vows.

The Girls' and Boys' Nights see the return of some familiar faces, and with them comes drama.

The final Commitment Ceremony. The remaining couples decide whether or not to go to Final Vows, and make a decision with their partner on life outside the experiment.

The brides' homestays continue, then fallout from the week away hits the dinner party.

Brides' homestays. The grooms travel back to their wives home to see what life together might be like outside the experiment.

A shock departure at the Commitment Ceremony rocks the experiment.

Dinner party. Shock revelations stun the experiment and spark a big walkout.

Grooms' homestays continue. The brides travel back to their husbands' home to see what life together might be like outside the experiment.

Grooms' homestays. The brides travel back to their husbands' home to see what life together might be like outside the experiment.

The fourth Commitment Ceremony brings out the first "I love you" of the season.

The fourth dinner party of the experiment is shaken by a new revelation.

Some couples are thriving while others are struggling as the pressure of the experiment starts to hit home.

Another shock jolts the experiment.

Who will leave and who will stay in the biggest commitment ceremony so far this season?

The first big scandal of the season hits the Dinner Party.

Meet the Parents continues. The couples get together with each other's families and friends, and not everyone is happy with the matches.

Meet the Parents. The couples get together with each other's families and friends, and not everyone is happy with the matches.

The second Commitment Ceremony. Who will stay and who will leave the experiment?

The second dinner party kicks into gear as the group dynamic causes some couples to thrive and others to struggle.

Intimacy week continues, but some couples are struggling with the concept.

Intimacy week. The couples enter the next phase of the experiment, and move into their apartments and work on their physical and emotional intimacy.

First commitment ceremony. Couples must decide whether or not to stay in the experiment for another week.

The first dinner party where all 10 couples get to meet for the first time.

The final four couples head off on their honeymoons, looking to take their relationships to the next level.

The final two weddings of the experiment bring one drama-filled reception.

Two more couples meet and marry at first sight, including one of the most anticipated weddings of the season.

The first six couples head off on their honeymoons as they enter the next phase of their relationship.

Australia's most controversial social experiment is back. Has science found the right formula for the next two couples to be married at first sight?

Australia's most controversial social experiment is back. Two more couples walk down the aisle looking for love.

Australia's most controversial social experiment is back. Can 20 singles meeting and marrying at first sight find their happily ever after? On this episode: the hens and bucks nights, and the first couples walk down the aisle.