Alessandra Rampolla

The final and most radical phase of the experiment sees a huge twist. The brides and grooms now watch back on the footage of the final test, and some are shocked to their core.

The unforgettable final test is back, and the experts have upped the ante like never before. All participants will meet with their alternate matches.

Australian couples take part in an experiment, meeting for the very first time at their wedding. The couples honeymoon, meet the in-laws and set up home, all the while getting to know one another more intimately.

It's been one month since the experiment ended, and the participants come face-to-face with their ex-partners at the reunion dinner party. But for one couple, it's a celebration.

Australia's biggest social experiment comes to a close, but not before the experts hold behaviours to account one final time. Some never-before-seen footage leaves the room speechless.

It's the final dinner party and the group's last dramatic get-together before final vows.