Sonny, Mark and Jerry investigate an expensive game fishing cruiser with three men aboard after Skippy and Sonny came across men trapping animals in the bush at night. Swimming out to the cruiser, Jerry overhears a conversation which indicates the men are stealing koalas for Dr. Stark's private zoo.

An invasion of sports cars threatens the life of protected fauna in Waratah National Park, but when Matt leads a rescue squad to save the life of a driver pinned under his car in a serious accident, the rally organisers gratefully decide on another venue.

Skin-diving geologists discover aluvial gold on a reef at Seal Rocks, in the mouth of the Flinders River. Thieves move in armed with deadly spear guns, and once again Matt, Sonny and Skippy are there to stop them.

Matt Hammond is faced with a human problem when one of his rangers moves to a new nature reserve up north, taking his wife and sons but leaving his daughter Clancy, who has exams pending, to board with the Hammonds. Clancy is in trouble from the moment she comes to stay, and she gets the idea she is not wanted and runs away.

Sonny takes Clancy to his secret hideout where the pair are taken hostage by an escaped convict. Skippy brings help and jumps on the convict, allowing Sonny to get free of his clutches and for Matt to overpower the criminal.

An old tramp, Trundle, looking for odd jobs, fascinates Sonny with tales of adventure. However, Matt Hammond believes the stories are figments of Trundle's imagination and considers it a bad association for Sonny. Trouble begins when the old swagman gives Sonny an expensive antique watch as a parting gift. Matt discovers the gift, asks the police to trace the owner… and discovers the Swagman's secret. Trundle turns out to be Miles Vincent Archer, the wealthy chairman of a vast corporation.

Sonny paints a picture of Skippy for his art class but before he mails it in, Mark replaces it with a 'better' one he made to help Sonny get a better grade. Sharing Mark's good intentions, Clancy unknowingly swaps Mark's painting for her 'better' version but when the painting is entered in a prestigious art competition and talk of an art scholarship begins, Clancy and Mark must come clean.

Skippy rescues a baby from drowning when the child's pram rolls into the river. Skippy alerts Sonny who brings the baby back to the house just as Matt, Jerry, and Mark are leaving to help the distraught parents search for their lost baby.

A diamond thief loses a valuable necklace while on the run from the police in the park. The thief sees Skippy find it and places it in her pouch and follows her back to the ranger station where the Hammonds are busy building a parade float. The thief stows away on the float and a dramatic fight breaks out when he tries to recover the necklace as the float makes its way through the streets of Sydney.

Dr Stark sends an operative into the park to collect a rare ant-eater specimen using a special gas-emitting camera. Clancy stumbles across the collector and is temporarily paralysed by the device. Skippy returns an incriminating audio recording of the encounter back to the ranger HQ leading to the thief's capture and Clancy's safe return.

Sonny and Skippy discover the hidden entrance to a remote valley, thought to be inaccessible and uninhabited. There Sonny makes friends with an old Aboriginal living alone, whose tribe has long since migrated to other parts of the country. One day Sonny finds Tara weak and in a semi-coma — he believes he has been visited by a 'death spirit' and is going to die.

Matt locates Mr Judd, the businessman whose life Tara saved, hoping he will help bring in people from Tara's tribe who will have the ability to free Tara from death.

While Park Ranger Matt Hammond and Clancy are busy fighting a bush fire, Jerry makes a gallant attempt to win the Bondi Surf Championship — despite having just sustained serious injuries while rescuing a surfer girl in distress.

Skippy stumbles on a secret boxing training camp illegally set up in Waratah National Park. A young champion, Rocky Miller, takes a forbidden joy ride in the helicopter with Jerry King, and a forced landing has surprise results.

Flight Ranger Jerry King breaks Waratah Park regulations when a helicopter flight is the only way he can keep a date with his girlfriend, Babs. A dramatic crash results — and Skippy again comes to the rescue.

Two Crash Detectives investigate Jerry's helicopter accident and are unable to substantiate his story of going off course to check on a bushfire. Skippy and Sonny head off to find the evidence needed to clear Jerry of the charges.

Sonny and Skippy become guides for foreign children stopping at Waratah National Park while touring Australia.

Sonny travels to Sydney to persuade his friend Mr Trundle (alias Miles Vincent Archer) to return temporarily to his desk as chairman of a vast corporation and reverse the board's decision to despoil Waratah National Park by drilling for oil.

Thrown from her horse deep in the bush of Waratah National Park, Clancy is hopelessly lost and her mother is due at Ranger Headquarters to see how Head Ranger Matt Hammond has been looking after the teenaged house-guest. A band of aboriginal nomads find Clancy and bring her back to headquarters, just in time.

A pair of industrial spies, on the trail of a secret roll of microfilm, masquerade as detectives and try to cover their tracks by accusing Mark of a hit-and-run accident. Only Skippy is aware of their true identities.

Overhearing the doctor tell Matt that he ought to marry again, Sonny tries his hand at matchmaking when he answers lonely hearts advertisements in Matt's name — and has to face the consequences.

Sonny finds a man chopping down trees in Waratah National Park and when Sonny tells him it is illegal, the determined man insists that he owns the land. Matt Hammond has received word from Jerry of a bulldozer clearing land in the Park, and Mark radios in from his patrol boat that someone is building a fence down by the river. It transpires that "Honest Jack", a slick operator, has been selling blocks of land in Waratah National Park. For his final scam he tries to sell off Ranger Headquarters as an 'ideal home'.

Mark and Jerry go to investigate when Clancy notices someone lurking near the helicopter hangar. Jerry is astounded to find someone he has known since childhood. His friend, involved in an armed robbery and with a bloodied bandage around his head, convinces Jerry he is innocent and asks for refuge in Waratah National Park.

A school for stunt men moves into Waratah National Park and Skippy, without needing any stunt lessons, saves their injured teacher.

Clancy's music teacher stops by Ranger Headquarters to share her concerns with Matt about Clancy's recent change in behaviour. Mark convinces Sonny Clancy is living a double life and is being blackmailed — just like in Sonny's novel. While Sonny waits to catch the blackmailer, Matt follows Clancy in Sydney and discovers the truth.

Sonny discovers two dead possums in their tree trunk home and Matt is disturbed by the number of dead animals that have been found in the bush over the last three days. When Skippy is poisoned and almost dies, Matt calls in Veterinarian Officer John Manson. A poultry farmer with a grudge against Matt is responsible and Matt tricks him into revealing his guilt and the location of the poison.

An old gypsy woman takes her revenge on Head Ranger Matt Hammond and his boys in a way that proves more embarrassing than harmful. Even Skippy is powerless to prevent the trick.

In Matt's absense, an inspector from the Department of Civil Services arrives to evaluate operations at Ranger Headquarters. His strict by-the-book manner creates trouble for everyone and his panic during a crisis has near fatal consequences.

Clancy thinks no one has remembered her birthday unaware that Mark has been planning a surprise party. Matt and Clancy run aground in the Ranger boat and nearly miss the party when they must walk back to Ranger Headquarters.

The National Park must be closed to the public after a number of animal traps are found. A recently released prisoner working with local miscreant Ben Schuyler is responsible but it is not just the animals that fall victim to the traps.

Mark begins training so he can participate in the Waratah Athletic Association's cross-country marathon that is being run through the park. Despite taking a commanding lead in the race, in no small part due to a route mix-up, Mark isn't the first one to bound across the finish line.

Sir Adrian Gillespie arrives at Ranger Headquarters with news that Skippy is to be sent away to Sydney for a long-term scientific study to determine what makes her the world's smartest kangaroo. To avoid losing his friend, Sonny sets out to illustrate she's anything but.

Jerry is asked to be the Best Man at a friend's wedding but gets caught up chasing two hooligan's in a stolen motorboat and rescuing a stranded hiker.

Matt Hammond is expecting a visit by a man to assist with blowing up an abandoned mine in Waratah National Park. The man turns out to be an old army buddy, Toby Boughton. Later, following an accidental detonation caused by a wombat, Matt and Toby are trapped in the mine which is slowly filling with water.

When Sonny and Skippy help an attractive young scientist in her research work on sharks, only the last minute arrival of Jerry and Mark in the Ranger helicopter can save them from a school of maneaters.