While Matt and Mark are helping out a ranger who has broken down in a downpour near a swollen creek, Sonny and Clancy receive a visitor who matches a radio news report's description of an escaped robber.
Sir Adrian Gillespie brings Professor Leonard Clifton to Waratah National Park so he can take Skippy to a laboratory to study her and find out what makes her so intelligent.
An aggressive National Parks & Wildlife Service inspector arrives at the Waratah National Park determined to instill fear into everyone at Ranger Headquarters.
Sonny's been reading a lurid novel about blackmailers and he spots Clancy crying after reading a letter, he becomes convinced that his young friend has received a note from someone demanding money.
Sonny is trying to study for school exam when Skippy takes him to a baby wombat whose mother has disappeared. He takes it back to ranger headquarters where chaos ensues when Mark tries to take him to quarantine.
When Sonny and Skippy discover a herd of wild horses damaging vegetation in the Waratah National Park, Matt enlists the aid of two champion rodeo riding brothers to capture them.
Jerry goes to Sydney Airport to meet a visiting ornithologist, who turns out to be a lovely young nun. Mark finds a person trying to poach some birds from the Waratah National Park.
An elderly ornithologist is determined to prevent a group of young water skiers from using the river and scaring off the birds he is recording the sounds of.
There has been a bank robbery and the two robbers have hidden the money in a treasure chest in Matt's car. The chest should contain the prize for a treasure hunt being organised for children in Waratah National Park by the rangers.
Sir Adrian Gillespie enters a horse in the Corinthian Handicap, a race for male amateur jockeys, at Royal Randwick. Skippy places a $1 bet on a horse with odds of 33:1.
Clancy sits her final music examinations. Sir Adrian Gillespie brings an English visitor to the Waratah National Park to discuss an exchange program with Matt.
Sonny and Skippy become involved in a bitter feud between two old, hard-headed bushmen when they see one of them practising a sheep-dog trial in the Waratah National Park.