Gampu and Laura are lost through a black hole. Chris leads a rescue mission against orders, combating an alien monster and contending with an arrogant new recruit whose selfishness jeopardizes the mission.
The Cadets investigate a hulk adrift in space, debris from the Vegan War of 200 years earlier. They find and revive a cryogenically suspended soldier convinced the war is still underway and that the Cadets are enemy combatants.
The Alturus agricultural asteroid is plunged into a deep freeze when its reflecting mirror becomes misaligned. Chris and Paul with stowaways Loki and chimpanzee Jake hope to arrive in time to save the crops.
Tee Gar invents the Cryotron, a device that emits an amazing freeze ray, but which is also unstable and causes whatever is frozen to explode within minutes. While conducting field tests, the Cryotron falls into the hands of an alien.
Gampu is humiliated by a cocky young Cadet and comes to believe that at 300 years of age he has nothing left to offer Space Academy except his resignation. Chris and the Cadets rally to restore their commander's self-confidence.
Dispatched on a dangerous assignment, Chris bristles at being under the command of his nemesis Matt Prentiss, a smug and swaggering show-off who flouts safety regulations and endangers the lives of his crew.
The Cadets come upon Space Academy's twin planetoid, inhabited by the legendary Captain Rampo. The iconic captain has been waging a long and lonely war against alien vapors that feed on energy and that now threaten the galaxy.