After finishing up on an aerial photography assignment which involved documenting a forest fire, Chuck and P.T. get hired to look for a store owner's missing father-in-law, who as a "weekend" uranium prospector had previously found some high level ore. Upon landing in the area, the pilots are met first with verbal resistance from two shady characters and once back in the air, gun fire.
The circus is in town, but their resident gorilla, Congo, is ailing and not able to perform. When his trainer tries to give him a shot of penicillin, the ape escapes and runs into town, causing terror among the residents. Chuck and P.T. take to the skies to track the sick animal.
Dave Williams is one teen with a bone to pick. He's angry at the way his older brother has been treated by the law. To draw attention to this situation, he climbs to the top of a local building with a rifle. He gets a lot of attention quickly, including that of a newspaper journalist who smells a good story. The reporter gets P.T. to fly him up to the roof so that he can interview the troubled young man and at first, it looks like the boy is ready to give up. Only the newsman knows that the longer he keeps the kid on the roof, the better the story becomes. Will this help the youth, or lead to disaster?
In what seems like a routine day, the Whirlybirds' radio suddenly crackles with an SOS call. Three mountain climbers are being hemmed in by an out-of-control forest fire, with one man seriously injured and the other two in bad condition. Chuck and P.T. must first try to find the men, and then determine if they are even able to attempt a rescue.
A mining company calls Whirlybirds, Inc. with a desperate need. There is a child in their construction office up in the mountains who is very ill and in need of a negative pressure ventilator known as an iron lung. In route to the remote location, a fierce storm buffets the Bell 47G and threatens to bash the respirator against the canyon rock face.
One of the Whirlybirds, Inc. most popular hires is during hunting season, when they will typically fly a sportsman into a remote area to hunt wild game. One such trip involved a classy dressing man by the name of Malloy, who hires P.T. and Chuck to fly him up into the mountains for the weekend. The pilots soon meet another man named Sandy who approaches them for help. He tells them that Malloy is not there to hunt game, but the prey is a man.
Three boys on a camping trip in the mountains explore a ghost town left after the minning ended in the California mountains. Two of the boys accidentally fall into an old mine shaft. The youngest boy goes out to find help even though he is far from civilization in the mountins. Chuck and P.T. see the boy from above in their helicopter and fly him to a hospital, then go back to try and find the other two boys and help them get back home.
Three escaped prisoners force the pilots' secretary Janet Culver to hand over the keys to an aircraft, knock her unconscious, and make their airborne escape. The prison warden arrives and fills Chuck and P.T., just back from a mission, in on the situation. They go after the prisoners while the warden awaits back at the office. Meanwhile, the convicts are forced to come back to the airfield because they are running low on gas!
Chuck and P.T. are accused of smuggling diamonds into Mexico. A helicopter marked with their registration number, N975B, was seen there on the same day the diamonds were smuggled across the border. The pilots have an alibi and give the agents a client's address, confident the client will vouch that they had taken him on a fishing trip. Unfortunately, the address turns out to be a vacant lot!
A man takes the law into his own hands and shoots a deputy who has come to evict him and his wife from their cabin. The man who wants the couple evicted starts a mob riot in the name of vengeance for the shooting. A newspaper man hires Chuck and P.T. to take him to the place of action. The pilots, along with the newspaper man, try to convince the hunter to surrender.
Ben Carling hires the pilots to take him on a hunting trip. Ben claims he wants to kill some predators stalking local sheep herds. Chuck and P.T. sense there is more to the story though, as the man is too tense, too focused on the hunt. As the adventure unfolds they learn that, Ahab-like, Carling is intent on killing a certain mountain lion because he lost a hand in an earlier encounter with the animal.
Whirlybirds, Inc. has a new pupil, Linda Watson. She is attractive and very charming, and soon learns enough about their Bell 47 to be able to fly solo. Departing on her solo flight, she starts flying the wrong way! Ignoring all orders on the radio to come back to the airport, Linda heads for a nearby prison to help her boyfriend escape. P.T. and Chuck must chase down the woman and her boyfriend and get their expensive helicopter back.
The pilots are hired by a wealthy businessman to fly through some rough weather and bring "medical supplies" to his mountain retreat. P.T. and Chuck are not happy when the so-called "medical supplies" turn out to be a box of cigars! With the weather closing in, they decide to stay overnight and return to Longwood Field the next morning. In the meantime, they befriend the businessman's seven year old son and promise to take him flying in better weather. But next morning they wake to discover that the boy has set out to climb a mountain top on his own and is in danger.
Chuck and P.T. agree to deliver a solid fuel bomb into a canyon, where it will be tested. But there are complications. Chuck discovers that the scientist involved with the testing, David Davis, is an old rival: Davis is married to the lady who was once Chuck's fiancé! Chuck must come to terms with both the complexities of the mission and the pain of facing his ex-betrothed.
Driving through town, Chuck and P.T. pick-up a new client at a street corner. Before they can get to the airport, their client, Mr. Garvey, has them stop at a bank. Mr. Garvey then proceeds to rob the place, threatening that he has a bomb in a small black box he carries. Garvey then threatens the pilots with the bomb and forces them to fly him to a mountain, where he ends up holding a family hostage in their home. It is up to P.T. and Chuck, along with the police, to try and save the family.
While flying, Chuck and P.T. notice a couple's car being forced off the road. A hot pursuit takes place and the pilots call the police and proceed to land and try to save the couple. They then learn that the couple, Virginia and Jerry Clark, are supposed to testify against the head of a crime ring and that was why they were being chased by thugs.
Chuck and P.T. are hired by the United States Army to help in air reconnaissance. They are instructed to look for anything or anybody that looks suspicious near some installations. The pilots soon discover a ring of people who are sending coded messages in a very clever manner.
Chuck and P.T. are hired by three prospectors to fly gold out from a mountain and bring in supplies. The mountain has a bad reputation, though: legend has it that if anyone tries to take gold away from the mountain (which is sacred to an Apache community), they will meet a most unseemly end. The pilots soon discover that the three prospectors don't trust one another and foul play is about to happen.
Chuck and P.T. discover a man, who claims to be a writer, living in a camouflaged dwelling in the middle of a desert. Chuck is suspicious of the man's story and is convinced that he has seen this man somewhere before. Upon returning to town, Chuck plows through back issues from the newspaper office and discovers that the man looks a lot like a missing financier sought by the police.
Jeff Simmons becomes fearful of flying after a bad plane accident and gives up any hope of staying a pilot. He is miserable with his new job in insurance sales. His family, with the help of Chuck and P.T., try to talk Jeff into the pilot's seat again, but to no avail. But then a crisis develops and Jeff is forced to forget his fear of flying.
Chuck and P.T. are hired by a diver to help him recover pearls from an oyster bed. The trio must hurry because the pearl hunter's former partner, Hank Maples, is also racing towards the site. The helicopter and crew beat Hank there and begin the dive. But before long, the former partner shows up with his brother, weapons in hand and ready for a confrontation.
Chuck and P.T. answer an SOS call coming from a yacht. They agree to transport a passenger covered in bandages to a hospital. But they become suspicious of the incident and report the transfer of the patient to the immigration authorities. The pilots decide to investigate further and find themselves in the middle of a power struggle between gangsters.
The pilots are hired to fly a client to Las Vegas. The client suddenly decides to take off with gamblers in hot pursuit! The criminals then take P.T. as their hostage while they begin their search for $150,000 which was taken from them by the client. Chuck must lead police to the killers and rescue P.T.
Chuck and P.T. frantically search for their secretary's nephew, who while playing, has hidden in the trunk of a rusted car. The car has been removed from a vacant lot and is en route to a junkyard. The boy, unable to yell loud enough for help, is now unconscious from a lack of air. The pilots know that time is running out to find the car with the child alive.
Chuck and P.T. are hired to transport film from a remote location site for a motion picture company. P.T. happens to photograph a recluse rescuing the film's star. The photo creates a sensation in the newspapers. The pilots are sued for invasion of privacy by the man who has a sudden change of mind when he has a heart attack and needs transport to a hospital.
Sniper shootings have been happening around the area and it is being done by two kids on motorcyles who are doing it just for kicks. They spook Helen and her boyfriend when he takes her out for a ride on his motorcycle. Heading back to the airport the two boys confront them and pick a fight until Chuck and P.T. step in and chase the boys away. To get even the boys shoot at the helicopter as it flies overhead, damaging one of the fuel tanks. The boys then take a shot at Chuck and his friend while they are outside and accidently his friend, Bill, get shot in the arm. Chuck and P.T. give chase and catch one of the boys who can't start his cycle. The other gets away. P.T. manages to get the motorcyle started and heads out after the other boy. Chuck goes for the helicopter and together they corner the boy down in the canyons and bring him back to justice.
When a plane flown by a veteran pilot disappears on a routine flight, the Whirlybirds are called in to assist in the search over the objections of the plane's co-owner. After discovering the crash site, Chuck and P.T. are disturbed to learn that the plane's controls were tampered with after the crash in an effort to fool the Civil Air Patrol investigators and are baffled when the police report that the pilot was dead before the plane even took off. Lt. Hurst asks the helicopter pilots to assist him to trap the man who actually flew the wrecked aircraft.