A group of Scottish school children travel to Australia in search of UFOs. The exciting journey is just the beginning of their adventures as the young explorers record their experiences on camera.
Simon and Chrissie decide to stay one more night at the camp sight before they leave. Meanwhile the others get lost and David and Leon continue to fight and argue. Shona shows Sarah the capsule.
The man, Joe, takes of his bike helmet and asks them to take them to their leader, which causes Simon to faint. Joe goes over to Simon and pulls a couple of ticks of Simon.
When asked how he knew about the diamonds Arnie says when they said they caught a man called Joe he put two and two together. Sarah points out that she never said anybodies name.
The group are picked up by a helicopter and taken to an illegal military center. However, they discover that their mobile phones are missing, they are constantly watched by CCTV cameras and are cut off completely from the outside world.
The group abandons Rusty and takes a Toyota Landcruiser instead, Meanwhile Simon rushes to find the group as they travel to the Glass Mountains in a hope to reconnect with the aliens.
The group go to the caves to look at the cave paintings. Lucy waited outside. The rest of the group got caved in and Lucy ran for help, only to trip over and fall unconscious.
The group's suspicions heighten as Stanich becomes more and more vague with her explanations. They stage their escape, but it was all too easy. What does Stanich have planned?
Harry begins to suspect that there is a traitor in the group. With the help of Ed and Seb, they break into a military base in order to find out the fate of the rescue pilots.
It becomes evident that the group is invisible and their parents cannot see them. A news report includes an eyewitness account of 'four walking into the waves'. Four? - there are six of them.
Stanick tracks Harry and Lucy down at the lake. Shona is the second of the group to go missing and Harry's left eye is blazing red. They decide to trust Stanich and get help. Meanwhile, Chrissie and Simon continue their search for Gerry.
Members of Falkirk's UFO club, head to Australia to an abduction hot-spot. Armed with video cameras and hoping to spot something extraterrestrial, they are met by Melissa, an Aussie ranger, who will accompany them to the outback.
Sarah stops David from doing something stupid. Which causes him to go off at Sarah. The next day Chrissie wakes up to find her self alone in the canoe. She goes a shore and finds Simon who tells her the canoe has sprung a leak.
Sarah tells the group about her UFO encounter. The others don't believe her. Leon is bitten by a red-belly black snake. Shona goes to get the anti-venom from the medical kit, only to discover it is missing.
The group have a hard choice to make over how to save Leon after being bitten by a deadly snake. In the end it is decided that Melissa must make the trek across the outback to the road.
Chrissy follows Simon who has run away, claiming that he is following Gerry and Melissa. Meanwhile, the others find mysterious markings and a burned out crop circle in the ground.
Harry recovers and tells Lucy that he suffers from epilepsy and left his medicine back in Scotland, so he can be stronger like the other guys. Dingos invade the camp and Shona and Leon take refuge in a tree.
