Australia's most controversial social experiment is back with another intoxicating mix of love and drama. Tonight Bucks & Hens and the first two weddings.

The next two couples walk down the aisle to meet and marry at first sight as Australia's most controversial social experiment returns.

The weddings continue as two more couples put it all on the line to meet and marry at first sight.

Drama hits the experiment as the Honesty Box is produced on the honeymoons with unexpected consequences.

The final two weddings. Is it love at first sight for one couple?

The first Dinner Party of the season. All the couples get to meet for the first time. One groom gets thrown under the bus.

Confessions Week. New honesty challenge that brings some couples to breaking point.

Confessions Week continues with some shocking revelations.

The first Commitment Ceremony sees the experts deliver some hard truths to the new couples.

Alessandra's Intimacy Week kicks off. Some couples thrive. Some struggle to connect with their partners.

Intimacy Week continues with some unexpected results.

Simmering tensions spill over at the second dinner party, producing an emotional walk out.

Single parents Selin and Anthony's chemistry is palpable from the moment they lock eyes.

Two new couples join the experiment, but one bride throws her wedding day into chaos.

There’s trouble in paradise as the new couples go on their honeymoons, and there’s more wedding bells.

It's the third dinner party and there's anticipation over the arrival of the new couples - but little does the group know a third pair is set to walk in

It's the third Commitment Ceremony. Some couples are growing stronger, but others are at breaking point. Cody and Selina and Jess and Daniel air their issues.

As Mitch threatens to leave, Ella faces the possibility that this could be the end of their relationship. But there is another shock exit on the cards.

Feedback Week commences and for some it's not all smooth sailing meeting the in-laws. And the new couples continue their relationship crash course.

It's time for the fourth dinner party, and while some of the original couples have found their way to a great place, the newlyweds are struggling.

It's the fourth Commitment Ceremony and a night of shocks, walkouts and couples clashing, leaving two brides struggling to find common ground.

With the Commitment Ceremony now behind them, our couples embark on the next phase of the experiment, the Retreat.

The Retreat continues. Following last night's drama, the couples are keen to gather for their final night at the Retreat. Some relationships are on the rocks.

Our couples return to Sydney for a Dinner Party. As they all take their places at the table, which of the many issues will surface first?

Following a week of drama at the Retreat, the couples reset as the experiment moves into its next exciting phase - Homestay Week.

Homestay Week continues, and the couples learn about each other by spending time at home and getting insight from family and friends.

The couples return from Homestay Week and head to the penultimate Dinner Party, where drama is brewing and wreaking havoc in the experiment.

As the couples prepare for the last Commitment Ceremony, the ramifications of last night's explosive dinner party reverberate around the group.

The couples start Reflections Week. They'll see what elements of their relationships still need focus and what advice they can give to others.

After two intense months, the couples have reached their Final Dates. They're given the chance to leave nothing unsaid and tackle the big issues.

The couples part ways to head out on Boys and Girls Night, where everyone is eager to confront Daniel and Carolina.

As the remaining couples come together for their final dinner party, long-running feuds and bottled-up emotions boil over.

Three couples leave the experiment and prepare for their Final Vows.

As the ninth series draws to a close, the last couples come together. Two couples will walk away still together, and one bride is left heartbroken.

Six weeks since the end of the experiment and the couples reunite. Grudges still simmer and a secret will come to light.

It's the final night of the reunion, and the couples reflect on their relationships and the rivalries within the group.