A Space Academy tournament, consisting of sports, a written exam, and a space race, pits the Polaris unit in competition against other Cadet units at the Academy. The chief competition is the Vulcan unit led by Eric Rattison. Controversy cast a shadow over the Polaris unit when evidence indicates that a member of the Polaris crew has stolen an examination paper from Dr. Dale's office.

An apparent plan by the Solar Council on Mars to break up Space Academy into three separate Academy's actually masks a much more sinister plot to start a revolution with the goal of destroying the entire Solar Guard.The Space Cadets wind up imprisoned inside an old rocket that has been programmed to go out of control and crash into the Martian surface.

Astro is believed to have contracted "Space Fever" a disease which could result in having him permanently grounded from space travel, and thus, out of the Polaris Unit. During his narration, Frankie Thomas defines for the viewers just what a 3-man Space Cadet unit, like the Polaris, really is.

The Space Cadets, along with Captain Strong, Commander Arkwright, and Dr. Joan Dale, seek an Academy scientist lost on a distant planet in an uncharted solar system. Their search takes them to the legendary Rocket Graveyard, where dozens of lost ships have accumulated over the past 200 years. The graveyard appears to be otherwise deserted, but there are unknown foes waiting -- not all of which are human.

A clue provided by a youthful stowaway provides the only hope of preventing Roger and Captain Strong from making contact with an anti-matter asteroid and instantaneous annihilation.

The Cadets are menaced by a weird, near-mute visitor from Alkar, the legendary black planet lying beyond the orbit of Neptune. But a much more deadly threat comes from an old and very dangerous enemy, that could lead to an attack against the entire Solar Alliance.

An adventurer calling himself the "Ace of Space"- stows aboard the Space Cadets' ship (the Ventura on this occasion) with the aid of the impulsive Roger. But "Ace" thereupon commandeers the ship and forces the Cadets to fly to Venus and help him search for the legendary Lost Colony. They do find it, amidst the Venusian jungles, but they also encounter the very same menace that wiped out the original Colony, established by the first colonists from earth 200 years ago!

The Polaris, on a mission to destroy a dangerous contra-terrene asteroid, is crippled by a split in the servo-gyro and forced to land on Jupiter for repairs.

Cadets Astro, Roger Manning, and Eric Rattison, out on space maneuvers aboard the Polaris, run into trouble when the Servo unit (which controls the automatic steering unit) on the space ship goes out of commission, and they are forced to make an emergency landing on Jupiter. Problems with Jupiter's intense gravitation field and ammonia storms threaten the ships' survival, and also hinder the efforts of Tom and Captain Strong to come to their aid.

The Space Academy is in danger of being closed down forever, so Tom Corbett and the Space Cadets risk their lives to save it when they come to the aid of passengers of a crippled rocket liner a million miles from home base.

Tom Corbett and the Space Cadets find treachery and danger on the deserted planets in the orbit of Jupiter.

Receiving an urgent distress signal from the black void of space, Tom Corbett and the cadets race to battle a dread disease which has ravished the colonial outpost of Mimas.

A feud between two cadets causes the wreck of the Commanders flagship during interplanetary war games. Tom, Astro, and Manning suddenly find themselves the target of deadly atomic torpedoes while taking part in maneuvers to repel a mock invasion from space. Cadets Manning and Eric Rattison (Sutton) tension builds when Eric is temporarily assigned as an extra member of the Polaris Crew. Past differences are insignificant when the two are trapped together fighting for survival and facing death.

In a daring maneuver, Tom Corbett and the Space Cadets use their spaceship to prevent the destruction of an important agricultural station.

A mysterious rocket ship drifts through the skies destroying liners in seemingly accidental crashes. When cadet Astro is accused of negligence, Tom steps into the picture.

A crooked mechanic tampers with the beacons surrounding a space junk field thereby hoping to waylay a treasury ship.

An airport is threatened with destruction when an explosion occurs aboard a spaceship in flight.

The cadets disguise themselves as prospectors to trap space gangsters who have been preying on uranium seekers.

Two pretty young auxiliary cadets make an emergency landing, causing their spaceship to crash-land on Jupiter through negligence.

A freighter Captain & his first mate do not properly maintain the antiquated vessels they purchase, the result is death for the passengers and crew of 5. The negligent Captain kidnaps Roger for his crew on another ill-fated vessel. Tom and Astro, posing as civilian passengers on the freighter, must rescue Roger and stop Captain Farley before the malfunctioning freighter crashes on the moon.

A tyrannical officer forbids the crew to leave their ship while in port.

Tom Corbett is called upon to halt sabotage of a cargo firing tube.

No description available

A machine causes a cave-in under the moon's surface.

Liquid compound K has seeped into the air and threatens the lives of those on the space station. Conspirators then plant a nuclear bomb to blow up the space station and its crew.