Sonny has been placed in charge of an automatic recording unit deep in the bush of Waratah National Park, supervised by his father, Chief Ranger Matt Hammond. While servicing the box, Sonny finds an Air Force pilot who has ejected from his airplane. In trying to rescue him, Sonny slips and becomes trapped on a cliff face. Skippy goes for help and returns with Matt who rescues Sonny and, with help from Mark and Jerry in the helicopter, the pilot as well.

As an amateur jockey, Mark is given the chance to ride Stormaway, Sir Adrian's best horse, in the Corinthian Handicap at Royal Randwick but when he goes missing before the race, Clancy secretly takes his place. Skippy places a $1 bet on a longshot, Wallaby Bill.

Ranger Headquarters is cut off by a violent storm as Matt Hammond lies poisoned by a snakebite. The phone line is down, the radio is not working, the serum is lost in the creek, the helicopter is out of fuel, the bridge is out and the ford is flooded. Skippy crosses an impassable gorge to fetch help, and the life-saving serum is parachuted to Ranger Headquarters just in time.

An amateur photographer shows Mark and Sonny some photos of an unusual animal which Matt thinks could be the long-extinct Tasmanian tiger. An expert is called in to verify the finding and while Mark has his suspicions, it is Sonny who discovers the men are working together to poach animals.

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.

When Aunt Evelyn comes to Waratah National Park determined to persuade Head Ranger Matt Hammond that he should put his younger boy Sonny in boarding school in Sydney. Sonny and Skippy save Evelyn from death by drowning and Sonny is saved from a fate he'd consider worse than death.

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.

A pair of travelling entertainers pass through Waratah National Park en route to their next performance. When Skippy disappears during a magic performance by Alfred the Great, Matt realises they've been conned. But that's nothing compared to what Skippy is capable of — with a little help from her friends.

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.

With Sonny Hammond as a hostage and a rifle pointed at Head Ranger Matt Hammond's head, bank robber Keeler forces Matt to drive him from Waratah National Park to keep his rendezvous with accomplices.

A professional woodchopper practicing illegally in the National Park solves a problem for Jerry by helping him and Mark clear land for an emergency helipad. When the axeman's competition sabotages his car in an attempt to prevent him from competing, Skippy comes to his aid.

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.

The animal and patrons of Waratah National Park run for cover when a bull gets loose and runs amok.

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.

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.

Alone at Ranger Headquarters, Jerry is overpowered by burglars who take everything movable. Later, Sonny and Skippy come across a group wearing Ned Kelly armour entering a cave. Sonny suspects they are the burglars, but they turn out to be a pop group, 'The Bushrangers', who have set up their instruments in the Park after being driven from their town by neighbours complaining about the noise. The group eventually help catch the burglars after a sloppy mud fight.

Sonny and Skippy see a flying saucer but the story is difficult to believe without seeing Sonny's photographic evidence — which he has lost. However, that doesn't stop the story from making the news, bringing a reporter out to Waratah National Park to chase down the story.

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.

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.

As Sonny urges his brother on, Matt plays along with Mark's plans of going on an around-the-world bicycle trip with a friend realising there are enough obstacles to halt the trip without him putting his foot down.

Sonny finds an orphaned baby wombat and brings it back to Ranger Headquarters where it runs amok. While Sonny goes in seach of the mother, Mark and Clancy must help with Sonny's exams and Matt calls from Sydney is need of some important paperwork.

Two high-altitude hot-air balloonists bail out over the Waratah National Park. With the pair at Ranger Headquarts, Sonny and Skippy find the bolloon and manage to get airborn. As the balloon drifts out over the ocean, Jerry and the others pursue.

Mark's homemade Hi-Fi stereo comes in handy when the radio at Ranger Headquarters is knocked out during a storm preventing Mark from delivering his father an urgent warning about a damaged bridge.

Sonny receives a steady stream of animal visitors while sick and confined to his bed. A home-made cold remedy may hold the answer — if Mark can get Sonny will take it — and if it's the right medicine.

While working on a project for Dr Steiner, Clancy encounters trouble and is in risk of drowning when her leg becomes trapped underwater.