A human expedition to another star system is jeopardized by the discovery of an immense bowl-shaped structure in space that leads to hostile alien encounters and profound revelations about humanity's place in the universe.

Studying the planets at school, Pedro learns fascinating facts about Mars.

Ryan and Regan Resnnick are trapped on a treacherous alien planet, surrounded by vicious predators, and in the path of a raging river of lava. And their troubles are only beginning...

Akiko and her friends reach the final stage of their mission to rescue Prince Froptoppit from the Castle of Alia Rellapor.

After crashing their spaceship in the Nevada desert, Klatu, Lek, and their sister Ploo go to Las Vegas in search of the one mechanic who can fix it.

A Jesuit leads an expedition to investigate singing emanating from a planet. So are discovered the Runa, intelligent beings, but undernourished. The explorers fix that and a population explosion follows, attracting space-age cannibals who start eating them. The explorers are killed, except for the Jesuit who tells the tale.

Oversoul, the master computer that cares for the planet Harmony, continues to weaken, leaving it open to a challenge by the warrior Moozh and his army.

While staying with their hippie grandparents, ten-year-old twins, Tod and Tessa, discover an unusual shop at the nearby mall, where they find a lie-detecting electronic pet, a Do-Right machine, and other alien gadgets which help them foil their nemeses, the evil Gneiss twins.

With its ally Erewhon growing restive, the Star Kingdom's Queen Elizabeth sends a mission to Erewhon, but upon arriving at their destination, they find a conspiracy led by the Solarian League's military delegation.

SOL-0045, a bolo on a mission that would end the civil war, finds himself caught in a moral dilemma when a young boy stands in his way and SOL begins to question whether or not bolos have souls.