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'.

While on a rafting trip throught the mangrove swamp, Sonny and Skippy come to the aid of a boy who has run away from his step-father while on a camping trip.

A spoiled young violin prodigy, and an old family friend of Clancy's, insists on acquiring a baby koala but Skippy saves him from losing his life in the attempt.

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.

A young National Service deserter risks recapture to look after Sonny after he is injured in a rockslide.

Jerry and a visiting ornithologist, who herself is not what anyone was expecting, nab two men poaching wild birds in Waratah National Park.

A shy and unassuming young woman visits Clancy at Ranger Headquarters. Mark makes an effort but Jerry goes out of his way to avoid spending time with her until Clancy, with the help of a friend, transforms her for a beach party.

Sonny wins a trip for himself and a friend to Sydney's Luna Park in a newspaper competition. En route, Sonny encounters a pickpocket who hides a stolen wallet in Skippy's pouch to evade the police. Sonny talks his new friend into rescuing a child trapped on the Ferris wheel.

At home alone during a violent rainstorm — and nervous about radio reports of an armed bandit on the loose — Sonny and Clancy are surprised by a suspiscious visitor.

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.

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.

The Great Carl, an itinerant puppeteer who is camping in the Nation Park, is jealous of his talented young assistant. A puppet show is held at Ranger Headquarters to raise funds for the RSPCA.

An elderly ornithologist's determination to prevent a group of young water-skiers from using the river results in an accidental fire, endangering the natural fauna of Waratah National Park.

Sonny is accused of being a dog thief by a man secretly training his sheep dog in the National Park. When the man's rival steals the dog he believes is rightfully his, Skippy helps round up the thief and the two men square off in an impromptu competition.

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

Skippy sees a large truck from which a valuable thoroughbred mare escapes from the man who stole her. The horse finds temporary refuge with Sonny in Waratah National Park.

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.

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.

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.

Two botany teachers hiking in the National Park ignore Sonny and Jerry's warnings and procede into a dangerous area only to run into an emergency when one is bitten by a snake. Skippy brings the snake back to Jerry who searches out the women to inform them the snake is harmless.

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.

An old friend of Jerry's who works as an air hostess seeks his help when she discovers she's being followed by two men after her most recent international trip.

Clancy's time with the Hammond family appears to be at an end when she sits her final music exam. Her departure is ensured when she wins a prestigious scholarship to study music in London. Sir Adrian asks Matt to select a Ranger to go oversees to work in Sherwood Forrest.

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.

When Sonny and Skippy discover a number of wild horses in the National Park, Matt calls upon a national champion rodeo rider and his brother to round up the herd before they can damage the park.