Buzz Corry, the Commander of the Space Patrol is in route from the planet Terra to Earth. He is accompanied by Cadet Happy, a new Cadet and winner of the Corry Scholarship. They spot what appears to be a derelict guided missile. As they move to destroy the derelict, its engines fire and the missile launches toward the commander's craft. The missile narrowly misses and changes course to intercept. In reality, the missile is a disguised ""cosmic"" bomb controlled by Major Gorla from his fortress on Kars. The Major is assisted by Matra, an assistant to Terra' Secretary General. Together they plan to conquer the United Planets beginning with the murder of Commander Corry.

Marta enlists the aid of Lt. Krasnoff a disgruntled Space Patrol to steal top secret materials and to destroy Commander Corry. Krasnoff holds a grudge against Major ""Robbie"" Robertson, United Planets Security Chief. Krasnoff paralyzes the Major with a ray gun and disengages the magnetic force control causing Buzz and Happy's rocketship out if control and into freefall seconds before landing.

Cabinet member Baron Von Kreitz hatches a plot to overthrow the General Secretary of the United Planets. The Baron sends Lt. Groat to prevent Commander Corry from delivering a report on Venus to the General Secretary. The information is passed to the Assistant Security Chief Tonga, who is wounded and partially paralyzed and imprisoned in the aft compartment of her space car. She manages to activate the ship's magnetizer, leaving a cosmic static trail. This signal allows Commander Corry and Cadet Happy to track her space car to the Baron's hideout on Earth's moon.

Carol Carlisle, the daughter of the Secretary General, is testing her invention she calls the ""Agra Ray."" The radiation from the device enables plants to reach full maturity within a number of hours. However, the ray may be perverted into a powerful weapon with the capability of turning entire cities into stone. Unknown to Ms Carlisle, her assistant is agent of Prince Greegor of Mercury. The lab assistant steals the Agra Ray and kidnaps Ms Carlisle, transporting them to Mercury, where Prince Greegor plans to threaten Terra, the Capitol of the United Planets.

Due to an extreme food shortage in the Juniper system, Major Robertson and Tonga are to transport the Agra Ray to prevent starvation in the colonies. They are met by the sinister Goron, posing as the Agricultural minister, He leads the to his headquarters at the foot of Cornicus' crater. He plans to steal the Agra Ray to force the growth of the ""ivy of death."" The vines give off a suffocating dioxide which he plans to use in destroying the Unite Planets.

Tonga is dispatched to Saturn's third moon after reports of trouble at the Cosmic Radiation Plant #1. Tonga's investigation leads the dismissal of the hot-tempered Captain Kronk. Kronk avows revenge and Tonga is shot with a shock rifle. Commander Corry and Cadet Happy arrive and rescue Tonga, but they are unable to capture Captain Kronk. However, they do arrest Kronk's assistant attempting to abscond with embezzled payroll accounts from the plant.

Cadet Happy makes his first solo flight to the Jupiter Space Port. Unfortunately, he acquires an unwelcome passenger named Lucky. Lucky is by trade an embezzler who is fleeing with Jupiter Trust Company's funds. To insure Happy's silence and cooperation, Lucky threatened to kill Carol and Commander Corry.

The United Planets Chief Astronomer discovers a planetoid has exploded. He sends an urgent report to Major Robertson at Space Control the debris posses a danger to all space raft in the area. Commander Corry, Cadet Lucky and Carol are returning to Terra from Earth when their space craft is struck by a meteor. They find themselves in dire straights: unable to navigate, unable to communicate, and venting oxygen through a hull rupture.

The owner of six lead mines on the moon Planos reports that an epidemic is spreading through the mines. Berger, the owner asks for assistance from the United Planets. Commander Corry, Tonga and Cadet Happy are dispatched on a rescue mission with the needed serum to halt the disease. However, Burger and his assistant are trying to keep quiet a secret discovery of a rich deposit of Exonium. Captain Happy discovers Leckner tampering with the atmospheric controls in one of the mine shafts. In a struggle with Cadet Happy, he unknowingly inhales a lethal dose of the concentrated bacteria.

Warden Sovak and his head trustee, Erik, have been arranging for prisoners to escape provided they can pay the appropriate fee. The prisoners are lead out through a tunnel which passes under an irrigation canal. After the report of three prisoners escaping the supposed escape-proof facility leads to an investigation. Commander Corry, Cadet Happy and Major Robertson carry out the inquiry.

Happy receives a cosmic ray burn during a routine training flight with Buzz and is confined to the Science Medical Center for treatment. While there, he is abducted by an escaped outlaw scheduled to undergo rehabilitation across the hall from his room. Can Buzz rescue his cadet before the Radurium glove Happy is wearing kills him?

Carol and Tonga's ship malfunctions shortly after take off from Jupiter and their ship plunges to the bottom of Red Lake and trapped below its frozen surface. Can Buzz and Happy rescue the girls before they suffocate?

The rehabilitated Tonga, cousin of the evil Barraccatti seeks Commander Corry's aid in locating a new work position. Buzz suggests she become Major Robertson's assistant but Robbie, unsure of her allegiance, resists. Rather than force his unwilling security officer to accept her, Buzz suggests a test of loyalty.

Still seeking to prove his theory explaining the exodus of the Carnacans, Pop Hanson locates a capsule that contains the indestructible weapon the lost race supposedly left behind. Pop's assistant, Pete, steals the weapon in an effort to blackmail the United Planets into submission. Can Buzz and Happy retrieve the device before all humanity is destroyed?

Buzz and Happy retell the tale of their first meeting with Tonga. They reveal that she is actually a rehabilitated thief who, along with Captain Holt, robbed lunar sightseers while on tour aboard Holt's ship.

When the lost city of the Carnacans is discovered on Mars, Buzz, Happy, and Carol decide to some exploring. While there, they discover they are not the first to reach the southern portion of the city.

An "Honor Farm" inmate uses an "unidentified" deadly weapon to escapes detention by shooting a guard. Can Buzz and Happy locate and apprehend the criminal before more people are hurt?

Buzz, Happy, and Tonga crash on Mars during a training mission. They safely manage to escape the damaged and radioactive ship but run into an old hermit living alone in a abandoned mine area. Are Buzz and his friends doomed to a similar fate or will they find a way to be rescued?

The Terra-4 is forced to land on the surface of Pluto while on a survey mission. The surveyors stumble on the device that grounded the patrol ship in an alien storage depository. One of the surveyors decides to do away with the rest of the claim a treasure in Tellurium for himself. Will he succeed?

While overseeing a special project, Robbie is abducted by from the Neptune Science Research Center Laboratory by Dr, Owen. Happy, in the guise of a patient, is sent to the doctor's facility to search for Robbie but is recognized by Dr. Owen and stashed in a remotely controlled space car. Can Buzz rescue the captured pair before the doctor can dispose of them permanently?

Cadet Happy is ordered to "meet and greet" two new cadets who are the scions of prominent members of the government. He takes an immediate interest in pretty Joan "Jo" Vance, but Ferris Macklin, the son of the governor of Triton, immediately expresses his discontent with being forced to join the Space Patrol. Their relationship is further strained when Macklin blames Happy for taking Corry's space cruiser through a meteor belt causing a crash landing when he, in fact, disobeyed Happy's orders concerning their course.

Fred and Sam Masterson plan to build and sell a revolutionary new affordable air car that will put the competition out of business. But someone is determined to prevent this even if it means killing Fred to do so. Can Buzz, Happy, and Carol find the guilty party and save Fred's life?

There is a traitor in the Space Patrol who is passing classified shipping information to his pirating partner. Happy knows who it is but he has disappeared. Can Buzz and Robbie rescue the cadet before he and Tonga are eliminated?

While Buzz, Happy, and Robbie are on a mission to clear meteoric debris, a would-be pirate and his partner steal a newly developed Space Patrol scrambler. Caught in the act by Carol, the thieves kidnap her and blast off for Mars and into the path of the meteors. Can Commander Corry and his friends rescue Carol and apprehend her captors before the damaged ship runs out of oxygen?

The abandoned Prometheus refueling station orbiting Ganymede has been declared a space hazard and is scheduled for destruction. Buzz, Happy, and Tonga decide to visit the facility but have not been informed that the destruction timetable has been moved forward. Will they suffer the same fate as the station?

A transportation company's ships are being robbed regularly, but only when they are carrying large amounts of money and credits. Commander Corry suspects that the ship's captain is stealing the money from his own ships and blaming a mysterious gang of space pirates to cover his tracks. Corry orders Happy to stow away on the spaceship and await developments, not realizing that the crooked captain has an informant working in Space Patrol's secret code section and passing along crucial information to the criminals.

Someone has shot the secretary General of the Space Patrol and stolen a locket that contains the secret of the element that holds the artificial planet Terra together. Can Buzz and Happy apprehend the traitors prevent the destruction of the capital of the United Planets and home of the Space Patrol?

On his way to meet Commander Corry at Venus City, Robbie's space car malfunctions and crashes in the jungle. He is then captured by the local natives while telling Buzz what happened. Can Robbie be rescued before he is killed by a crazed whip-toting treasure hunter.

Someone in Capital City is counterfeiting credits and flooding the United Planets with them. Can Buzz, Happy, Carol, and Tonga figure out who it is and how they are being distributed?