The top five celebrity teams race through the streets of Siem Reap, Cambodia's second-largest city, in the closest elimination leg of the competition so far.

Eleven celebrities set out on a race around the world with those they hold dearest. Starting on the chaotic streets of New Delhi, they get a taste of local life on their way to the first pit stop.

In Agra, India's city of love, the celebrities face extreme heat, a monsoon, and a Bollywood routine; the first elimination happens.

The final five celebrity teams face relationship tests in a race to a Cambodian floating village on Tonle Sap. They learn a Khmer song and harvest local food.

The celebrities embark on a spiritual journey to Angkor Wat, Cambodia, one of the biggest religious structures. They test their fighting spirit through local martial arts.

In Langkawi, Malaysia, the celebrities are forced to confront their fears; a fruit basket evens the competition; the race to the pit stop gets incredibly competitive.

The race heads to George Town, Penang, the colourful capital of the Malaysian island. A bold deviation choice makes more than one team feel uneasy.

The competition rages on as the celebrities press forward relentlessly without a break. After a gruelling day in scorching conditions, the contestants camp on the beach. It's the final showdown for one determined duo.

The teams travel to the Indian coastal state of Kerala and navigate the West Coast Canal System, where one team face a massive setback.

Eighteen Australian personalities take on a condensed version of the Special Forces selection course.

The ultimate test of trust between the recruits goes horribly wrong and a torturous casualty evacuation takes its toll.

Emotions run high among the recruits as they take on a harrowing death-by-drowning exercise, leading one recruit to drop out of the running.

The recruits face a shocking test of courage 30 metres above the ground and a claustrophobic underground task.

Recruits must reach within themselves for a backwards fall; a physical test turns someone to dirty tactics; secrets are revealed.

All 18 recruits arrive back at base camp for the last time to debrief with the DS and open up about their life-changing experiences.

A high-speed, high-intensity tactical driving mission puts the recruits under immense pressure; an explosive dressing down and an unexpected ambush make things difficult for the recruits.

The recruits face a 90m cliff face and a mission in a pitch-black tunnel, and one recruit is brought back to reality as another comes clean.

Recruits must play dirty when they're pitted against each other in a do-or-die test of grit, while an excruciating 5km log haul through rugged terrain has them dropping like flies.

Recruits undergo a test of mental strength in a kill or be killed scenario; a brutally cold ice drill stops some recruits dead in their tracks.

The recruits face a challenging casualty mission where they plunge down a rope from a helicopter that is hovering above water.