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Dr. Jose Calandre Garcia had been working on the theory of Mega- steam when he lost contact with his old friend Professor Poopsnagle. Determined to continue the work that Poopsnagle had originally begun, Garcia traveled to Australia in a hot air balloon in search of his old friend. Unbeknown to him, however, the wicked Count Sator had discovered his plan and sent his henchman Murk to shoot down the hot air balloon. Murk shot down the balloon, but the old doctor survived the crash and was rescued by some young children from a holiday camp in Secret Valley. When they heard the doctor's story of why he had come to Australia, they decided to help him in his quest to find the 6 minerals of Megasteam.
The only contact with Poopsnagle that remained was a telephone number. When Garcia called the number, he got a message machine. He left a message for his old friend to contact him at the Secret Valley holiday camp. Instead of Poopsnagle, Garcia was surprised when a young boy of 12 years old turned up instead. It was none other than Poopsnagle's grandson. Together they resolved to build a flying bus which was originally designed by Professor Poopsnagle to help them in their search for the minerals.
In a nearby deserted town, the children gathered all sorts of junk to help make the flying contraption. Luckily, they found the wreck of an old bus as the basis of the machine. With the help of the children, and following Poopsnagle's plan, the bus was eventually completed, and based on steam power it was able to rise into the sky and fly at will. Count Sator, however, sent another henchman called Willie Dingle to spy on the children, and within the ranks of the children he commissioned the young boy named Matt to keep him informed.
Poopsnagle's grandson Peter also had an ancient parchment that his grandfather had left him, and on the parchment was a cryptogram written in Latin. After the cryptogram had been decoded, it was only a matter of time before they found the first golden salamander. The golden salamanders had been buried long ago to indicate where each mineral could be found. After the first one was found, the cryptogram on it would lead the children and the doctor to the next one. What they had to do in each case was to decipher the cryptogram on each salamander. The first one led them to a cave not far from Secret Valley, where after being caught in a mine shaft and surviving a gas explosion, they were able to find their way down the shaft and into an unknown valley where they found the second salamander and the first mineral.
The cryptogram on the second salamander indicated that the children were to follow the arrow pointing towards the sea. Once they had taken off in the Poopmobile, and were traveling in the right direction, they found themselves caught in a gale. The storm buffeted the bus mercilessly, and after some time in which the doctor had great difficulty in keeping control, the bus eventually came out of the other side of the storm. Seeing an island, they decided to land and check to see if they needed to repair the bus.
Once they had landed on the tropical island, they found themselves confronted by a weird sound, and they also discovered footprints of an enormous size which indicated that there was a monster on the island. The cryptogram of the last salamander, when it was deciphered, turned out to be the island that they were on. Inadvertently the storm had placed them on the correct island, so they decided to split up in various groups to search for the next salamander and the next mineral.
In their search, two of the children were captured by pirates, and Willie Dingle had been flown to the island by Murk to keep an eye on what the children were doing for Count Sator. With great stealth, the doctor was able to free the two children and in turn Willie Dingle was captured by the pirates.
Together with Dingle, the doctor and children pressed on to discover the third salamander, after climbing down into a deep ravine, behind a waterfall. And surrounding the salamander was the second mineral. Once the Poopmobile had been fixed by Peter, the band took off from the island and headed homeward.
After returning to Secret Valley and deciphering the latest cryptogram. Doctor Garcia and the children prepare to search for the Rosy Prize. They know the way they must go, by the predetermined direction on the ancient Torres Parchment.
When Dingle takes to the air in his hang glider, helped by Matt, he crashes, but manages to bring the Poopmobile down using Mats darts to burst the hot air balloon. The children narrowly escape injury, but their precious Bus has been badly damaged. They have lost all the water from the steam turbine and it has evaporated away into the heat and sand. Jamie believes he must prove to himself that he has the ability to use his bushman's knowledge to find water in the desert, and he takes Shorty and Sparks with him on a journey into the wild desert.
When Sator returns to his comp, he berates Dingle and Matt for having lost the water, and commands them to raid the Poopmobile's camp. They do this at night, but are frightened out of their wits by Jamie, who has painted himself in ceremonial paint to commune with the spirits. He is trying to use his Aboriginal dream time powers to bring the rain. Whilst the Doctor and children are out looking for Jamie, Sator manages to raid the Poopmobile and steal the Doctors notes on Mega Steam. The Doctor and Children are devastated.
The next morning the rains come in torrents. The children gather the water to fill the fixed steam accumulator. Eventually they are airborne once more, but Count Sator has become bogged in the desert. It is Carmen who realizes that they are staring at the Rosy Prize and after a wind storm which whips some of the Doctor's notes away from Sator, the children not only find the Rosy Prize, but the Salamander as well.
In the barn at Secret Valley, the doctor and children decode the latest cryptogram. Matt however is listening outside and when the others leave the barn, he creeps inside and takes a copy of the decoded message. He is disturbed by the others, but not before he has planted a listening bug under the table, which Dingle is tuned in to, nearby. The lookout sees Dingle's car and Sparks decides to investigate. He discovers Dingle and learns that the barn is bugged. He runs back to warn the others. They find the bug and send Dingle in a different direction by giving him a false lead. The doctor and children leave the camp to search for the next salamander and mineral.
Followed by Murk in disguise, they make their way to a fishing village where two of the children are trapped in the hold of a ferry. Murk kidnaps Doctor Garcia and takes him to the castle, where Sator interrogates him and then throws him into a cell, not far from Poopsnagle himself. They do not know that they are so close to each other. The children suspect that the Doctor has been captured and enlist the help of the police to question Sator. Sator is very helpful and allows them to search the dungeons, but they do not find a thing. Poopsnagle has escaped once more and, as the door to allow the police to leave opens automatically, Poopsnagle takes his chance and runs out; but Sator soon recaptures the old man once more.
The children mount a night raid on the castle to find Garcia, as they are convinced that he is in the dungeons. They find Garcia (but not Poopsnagle, as they do not realise that he is also in the dungeons), however Sator traps them in the tidal cell, where the tide will eventually drown them. Matt, however, has been following their movements and he is able to help the children escape from a high air grate.
Once free, the Doctor and children fly to the island "which is joined by sand". This is part of the cryptogram, and they sight it from the air. When they land, they soon find the salamander and mineral with the help of a metal detector. Successful again, they head for home to decipher the next cryptogram.
The story begins with the children already on their way to their next destination. They have to find a bend in a river in the shape of an M. The River is in a northerly direction from their camp, and as they are flying, they see a bush fire in the distance and some people in distress. They land and rescue a man and a woman and some small animals. The woman is desperate for them to go after her daughter, who has left the farm in search of her horse Victory Stride. After dropping them off at the nearby town of Rivers Bend, the children search for Alice, the missing girl. They find her, and Carmen helps her by staying with her whilst the Poopmobile gives them directions from above. They escape the fire, and Sparks, back at Secret Valley, helps the situation by warning the nearby towns of Rivers Bend's distress. He also discovers the location of the salamander inadvertently, and is able to pass the information to the Doctor.
The latest salamander has been attached to the Jambaroo Shield, a trophy which is to be presented to the winner of a horse race called the Jambaroo Shield stakes. The children decide to enter the race with Victory Stride as their champion, but he needs a trainer. Dingle has been sent to buy all the other horses off; Sator wants to win the race for himself. He purchases a horse called Black Eye, and a jockey. Dingle then keeps an eye on the children and sees them searching for the mineral along the river. It transpires that old Sid Chesney, a horse-trainer the children have been able to persuade to train their horse, also knows of the whereabouts of the fifth mineral, for he was the person who found the Salamander originally.
After they have the mineral safely in their possession, they are about to go to the race when they find that their bus has been sabotaged by Murk who has sawn the drive shaft through. Race day arrives and Sator is filled with rage to see the Poopmobile flying to the race course, with Victory Stride slung underneath it. Sid Chesney has trained the horse well, and although Alice cannot ride it herself, because of an accident, Jamie has been prepared for the ordeal.
The race begins, and Dingle tries to send Jamie in a different direction by planting a confusing sign on the course. Sators jockey throws dirt in Jamie's face, and tries to push him from the horse. But Jamie hangs on, and even though Sator has planted a fresh horse on the track, Jamie still wins the race, with a little last moment help from Sid. The Salamander is theirs, but they are horrified to find that there is no cryptogram on it. And to make matters worse, Dingle has planted a vision bug on the Poopmobile which even Matt is unaware of.
In the Poopmobile as they return from their last adventure, Peter uses an old trick to divulge the secret of the last Salamanders cryptogram. At the base camp, they decipher the coded message and to their amazement they discover that the last mineral is positioned underneath the Sydney Opera House. How are they going to find it? Sator is heartily amused as he can see their every move on the vision bug, and he gloats in front of a terrified Poopsnagle. Sator has also arranged for Matt to let Dingle and Murk into Secret Valley late one night to take the minerals and Salamanders from the safe in the barn. Blackmailing Matt into helping him get the Doctor's notes, Sator now has all he needs to make Mega Steam.
In a kangaroo court, the children try a very despondent Matt, who tries to convince them that he has a plan to retrieve the booty from Sator. At first the children and the doctor are unwilling to listen, but when they realize that they do not have a plan without Matt's help, they decide to give him a last chance. Matt has been given a vision communicator as his payment for letting the enemy into Secret Valley He uses the communicator to contact Sator to record his voice, which they need to fool the computer that guards his castle. But to get into the castle, they have to somehow convince Sator to leave. Divina Devaga works in the department of antiquities in a museum in Sydney. Sator has never met the woman, although he knows she has a thick European accent. With the aid of Peter Poopsnagle's voice simulator, and a bit of make up, Carmen poses as the mysterious Divina, and fools Sator completely.
Whilst she is dining with him at Roberto's Restaurant, the others reclaim the minerals, notes and Salamanders from Sator's strong hold. But Sator returns before they have finished and captures Peter Poopsnagle. This is when Peter is cruelly reunited with his grandfather. Undaunted, the doctor and children go to the Opera House, where they are successful in discovering that the final mineral is water. Back at the doctor's laboratory, they are working on the Mega Steam problem when Sator contacts them on Matt's communicator. He tells the doctor that unless he gets the notes back by the next morning, they will never see Peter or his grandfather again.
Garcia concedes victory to Sator, but after the communication, he is successful in developing a small amount of Mega Steam. It is with this amount of Mega Steam in the Poopmobile that they are able to pull the side wall of Sator's computer room out and save Peter and Professor Poopsnagle from the jaws of Baby Julius, Sator's fiendish caged pet. Having dismissed Dingle, who angrily walked out of the castle after an earlier altercation with Sator and Murk, Sator is then left unprotected – and therefore unable to contact Dingle for help – as he himself meets a sticky end at Baby Julius' jaws, just as the others escape with their precious cargo (although Murk's fate is left unrevealed). The secret of Mega Steam is intact for the Geneva Convention to be used in the cause of a poullution-free world. The Poopmobile is now free to fly on to other adventures.[
