Karnati, crown prince of the Krokons, is being held captive on earth to ensure peace between the two planets. But then Dr. Gorman strikes a deal with the Krokons: he will give them Karnati in exchange for a valuable mineral - and the life of Interster captain Buks de la Rey.
Gorman and Karnati plan to hijack the SK Woltemade, but the day is saved by Pikkie the Robot.
Gorman and Karnati kidnap Lida to get information about the earth powers.
The Krokons destroy earth’s spacecrafts. Buks and Adam get sent to destroy their terrorist bases.
Spaceship Woltemade gets damaged, with the professor on board. Prince Karnati hears the ship's emergency signals and take his chance to capture the professor. But it turns out that the professor is too shrewd for him, and it’s not long before his evil plans start to fall apart.
Buks and Adam visit a radioactive planet to investigate its mining possibilities. Karnati decides to get rid of them.
Gorman and Karnati sends a unmanned craft to destroy earth, but Buks and Adam are prepared.
Buks and Adam get sent on an important mission: go to Krokon to find out what they can about the Krokons' plans.
Karnati and Gorman plan a trap for Buks and Adam.
A Krokon ship, carrying an anti-matter satellite, it on its way to earth and exposes Impala I and its crew to the weapon's deadly rays.
The Krokons turn Jupiter into a second sun in the solar system in an attempt to burn up the earth.
The Krokons manufacture a black star to wipe out earth. Buks and Adam use a time machine to destroy the black star before it was even created!
Gorman and the Krokons want to narrow the asteroid belt, hoping to destroy earth with a constant meteor shower.
Gorman gets captured.
Buks and Adam have to relieve one of earth's planets after it was annexed by Krokon.
The earth gets trapped in time so that Krokon can get a good lead in its weapon production.
The Krokons disguise a projectile as Halley's Comet to mislead the earth.
Earth is in danger again - this time from a gamma ray satellite.
Buks and Adam use the Krokons' multi-laser weapon to their advantage.
When the Krokons lead Buks and Adam into a black hole, they enter a universe where everything's topsy turvey: the Krokons are the heroes and Buks and Adam the villains.
The Krokons attempt to burn earth with a giant magnifying glass.
Buks and Adam are sent to destroy a Krokon settlement - with orders to destroy their own ship if they need to.
Gorman escapes from prison and teams up with Karnati once again to destroy the earth. Our heroes manage to destroy the Krokon base, but not before Gorman and Karnati manage to get away.