Sonny and Skippy are in the park when they hear an explosion in the air. They come across an unconscious pilot who has ejected from a plane. When Sonny gets into difficulty, he sends Skippy to get help.
Sonny and Skippy discover two geologists diving on a reef in Waratah National Park. The geologists suspect that gold may have washed down the river and collected on the reef. Two criminals watch from afar, waiting for a chance to pounce.
Dr Steiner arrives at Waratah National Park to undertake research on the koala population but immediately clashes with Ranger Hammond by insisting on keeping the koalas in cages.
Skippy leads Sonny to an aspiring young ballerina who has been studying the dance of the lyrebird. When the lyrebird mimics an old man coughing, they search for a botanist who has been missing in the Waratah National Park for a few days.
Mark is annoyed when Ranger Hammond insists he spends the day assisting a marine biologist that is visiting the park. He changes his mind once he meets Dr Trout. Sonny and Skippy get into trouble while fishing.
After Clancy keeps a secret for Sonny, he agrees to take her up to visit his secret cave. There they get caught up in the escape plans of a desperate criminal.
When Sonny befriends a couple on their honeymoon in the National Park, the wife takes a real shine to Skippy. Soon it becomes clear she wants more from Skippy than friendship.
Mark and Clancy try to help Sonny get good marks at school when they substitute his painting of Skippy with their own, but they create a dilemma when it is entered in a competition that attracts an international art critic's attention.
A diamond thief has to join the Waratah National Park's float in the Sydney Waratah Festival procession in order to retrieve a stolen bracelet that Skippy picked up after he dropped it.
Sonny takes a job with a team of sheep shearers to earn money for a present for his father's birthday, unaware that the men are actually rustlers who intend to steal the wool.
An actor hired by Dr. Stark attempts to discredit Matt while impersonating him by running a car containing his boss and a Government Senator off the road.
Dr. Stark gets one of his henchmen to impersonate zoologist Professor Lewis. Armed with a mace gun disguised as a camera, the henchman attempts to steal some female anteaters for breeding in Dr. Stark's private zoo.
A young aboriginal woman with a beautiful singing voice is pulled between her dream to further her singing career and the call of her elders to return to her people.
While exploring a cave, Sonny and Skippy find a secret entrance to a valley that was thought to be uninhabited and inaccessible. There, Sonny befriends Tara, an old Aboriginal man living happily on his own.
With some help from Mark, Jerry makes an attempt to overcome injuries he sustained while rescuing a swimmer in trouble and win the main race at a surf carnival. Matt and Clancy are kept busy troubleshooting at the Waratah National Park.
A father and son boxing team set up camp in Waratah National Park to prepare for a big fight. When his son gets into a dangerous situation, the father is forced to realize what is really important.
Helicopter pilot Jerry plans to break the rules and visit a girl while on patrol. Before he gets a chance, he gets into trouble investigating a plume of smoke in the park.
While returning to Ranger Headquarters to meet Sir Adrian Gillespie, Matt, Sonny and Skippy stop to help a man who appears to be lying injured on the road, but the man produces a gun and orders Matt to drive him 80 miles to Dalmar.
When a mining company gets permission to search for oil in Waratah National Park, Sonny realizes that his swag-man friend, Mr Trundle, may be able to help.
While left alone at Ranger Headquarters, Jerry is overpowered by burglars who steal everything that they can move. When Sonny and Skippy come across a group of people dressed like Ned Kelly, Sonny thinks they could be the burglars.
Clancy's mother is expected at Waratah National Park to check on how her daughter is going, but Clancy gets hopelessly lost after she is thrown off her horse, and is followed by a group of Aborigines.
Mark is accused of a hit-and-run accident that leaves a man badly injured, but the police who arrive to investigate are really industrial spies attempting to cover their tracks.