The four remaining couples compete in a series of challenges, ending with just one couple winning the cash prize.

The competition heats up as everyone comes to terms with the surprise addition of a female geek, Helen, and male beauty, Troy. And with one elimination down already, the teams knuckle down to study for the challenges ahead.

A few crushes are beginning to form between the beauties and geeks but when it comes time for competition, romance takes a backseat as the teams try to master their recognition of famous faces.

It's not only the science of love but a science project that is keeping the teams busy. The beauties transform into hot science teachers as they present science projects to a group of school students. Who will engage the students with their knowledge of volcanoes, the solar system and anatomy, and who will crumble under the pressure? The geeks discover their inner beauty when they become cheerleaders for the day. Who will perfect their routine, and who will fail to bring it on?

There will be a transformation for one team, with the help of stylist Henry Roth after a photographic challenge. Posing as famous couples, from Adam and Eve to Antony and Cleopatra, is especially confronting for some. There is also a twist when girl geeks enter the house. Will the geeks trade their beauties?

The geeks are given an image overhaul with the help of an all-star makeover team. Celebrity stylist Henry Roth returns to oversee the remaining geeks' new looks, from wardrobe right through to hair and grooming. But will their outward appearance help improve their confidence? They'll be put to the ultimate test in a Full Monty-style challenge in front of a screaming crowd. Meanwhile, the beauties take charge of a fantasy superhero invented for them by their geeks. Who will have the right superpowers to keep their team safe? And in a shock no-one saw coming, one beauty decides to exit the mansion. Will her geek be able to continue in the competition?

The geeks are in for the biggest shock of the series. When the beauties face a spelling bee, it's not only torturous for them but has severe consequence for their partners - an electric shock.

The beauties are in for a mathematics lesson with a farmyard twist. The beauties are tested on something they've been dreading the entire competition - mathematics. But this is maths with a farmyard twist. Using numbered goats, sheep and other farm animals, the beauties must solve simple equations. The geeks face an equally troubling task when they're put in charge of styling some special friends when the eliminated geeks return to the mansion for a makeover. Which geek will wax, tan, groom and dress their friend to impress the ladies?

The beauties must strut the catwalk while embodying their geek's favourite London icon to impress guest judges Sonia Kruger and Jackie Frank. But they won't only be judged on their catwalk abilities; they'll also be judged on much they know about what they are representing - which ranges from the Queen to Big Ben. Meanwhile, the geeks are confronted with something unfamiliar: a naked woman. In this life-drawing challenge, the geeks believe they are being tested on their artistic skills but are in fact being quizzed on their ability to listen to women. Who will use their ears and not just their eyes to win the challenge?

In this season's final episode, our remaining four teams knuckle down for some cram studying in hopes of scoring the best school report card. The beauties must compete in a rocket science test while the geeks must bake a cake that represents their beauty in a home economics test. Together they will then be marked on a physical education task that takes the form of synchronised diving. Then, the final three teams travel to a school formal, where a dance-off will determine the final two teams who will go into the final elimination quiz. Which team will walk home with the crown, plus a $100,000 prize?

What will happen when the millionaire geek is revealed to the beauties? While the contestants come to grips with news of their cashed-up friend, the couples join forces for a world record-breaking attempt at the longest hug. Can they even come close to beating the record of 25 hours? The geeks will go from loveable huggers to vying for the title of 'toughest geek' when they take on meat pies, bikies, hot chillies, and arm wrestling. But will anyone step up for the toughest challenge yet and volunteer to have their nipple pierced for immunity?

Nathan gets his fair share of questions in the spa. The Geeks get a taste of wrestling. And the Beauties practice social etiquette.

The Beauties knowledge of the world is put to the test. Some of the Geeks are subjected to wedgies. And a break-up occurs.

Hair and Wax is everywhere in this episode. A select few are treated to a dinner party. And some familiar faces return.

The Geeks try out bodybuilding. Another makeover for a lucky Geek. And the nominations get tense as we get closer to the final.

Shetland Ponies carry the geeks closer to the finish line. The Beauties challenge is called 'Faking It'. And love is certainly in the air.

In the final episode, Bernies sets up the theme of fairytales. Triumphs are made, and failures accepted. And the winners are revealed.

The ultimate social experiment makes the move from the safety of a mansion to a beach-side paradise in Fiji, where eight new beauties are paired up with eight new geeks. After they spend a night out of their comfort zone in an open tent, the geeks have to channel their inner warrior when they perform a Fijian war dance in front of a real-life tribe, with the winner receiving a surprise package, while the beauties are tested on their English skills in a spelling bee where one incorrect answer sees their geek's undies filled with live crabs. The winners of the two challenges each nominate a team to send to the Elimination Room, where they compete in a quiz in which the team with fewer correct answers is eliminated.

Social boundaries explored for the Geeks. Maths challenge for the Beauties‡ while the Geeks are given a few social muscles to flex, the Beauties get in touch with their inner mathematicians.

The Geeks get up close and personal with a half-naked lady when they put to practise their newly acquired skills as a professional masseur. But will their scantily dressed client be evaluating their nifty kneading skills?

Sexy Photo shoot for the Geeks the Beauties become fait with that alternate universe teeming with vigilantes bursting with super powers, the Geeks must abandon that particular fantasy and indulge another. One that they've never dared dream of a photo in which their geekiness is defeated by their manliness.

Tonight, it's a make-over extravaganza for four Geeks as they are buzzed, buffed and bronzed. But, what causes one of the Geeks to burst into tears after catching a glimpse of himself for the first time post make- over? The Beauties must study up on all things international to impress a panel of genuine government leaders when they deliver a five-minute presentation about their adopted country. Meanwhile, the Geeks are thrust into the limelight as the entertainment for a real life Hen's night. Can the Geeks ditch their dodgy dance moves to perform a super sexy stripper routine and set the night on fire? And what will happen with Matthew finally confesses his feelings for Ntula?

Eliminated contestants find their way back to Fiji's shores and the makeovers continue, but this time the Beauties are calling the shots. The Beauties get up close and personal with some scary animals when they become a zoo keeper for their challenge. Meanwhile, the Geeks must tap into their female psyche to correctly answer multiple choice questions about their Beauty. But can the Geeks figure out what their Beauties really want? Or will they become tongue tied when faced with their Beauties' world of fashion, fake tans and fitness?

The Geeks need to be charming, confident and chivalrous after the girls set them up on a blind dinner date. The girls go back in time when they dine with two distinguished guests.

In tonight's season finale, the Beauties and Geeks test their relationships mentally, physically and emotionally. In three extreme challenges, the final four couples must rack up as many points as they can by swimming above a frenzy of feeding sharks, locking lips with their partners and competing blindfolded in a jungle obstacle course. Then, the three remaining couples will battle it out in a disco dance-off. Judged by a live audience, the two teams with the most votes will go on to the very last challenge of the series - the final elimination quiz.