After a recent daring escape attempt, Zak Nine and his Quom friend Erro are imprisoned in the most inescapable region of Alcatraz. The boys are locked in separate cages, hovering at the end of unbreakable chains over a boiling sea of poison. It's the most perilous adventure yet as the boys try to escape from Planet Alcatraz.

While avoiding a band of patrolling prison guards, the boys meet another escapee who tells them the legend of an abandoned spacecraft. The boys believe that if they can find the ancient ship, they'll be able to fix it and blast off from Planet Alcatraz.

But now they find themselves lost in a vast forest of alien birds and deadly plants. The prison guards are searching for the boys using a flock of remote bots, armed with flame-throwers and sleeping gas. Will the boys outwit the bots and find a way off Planet Alcatraz?

During their last adventure, Zak Nine and Erro found a mapping device in a crashed prison ship. Other than an occasional giant scorpion, the boys seem to be safe on the endless sands until they spring a deadly trap! Huge rocky walls spring up from beneath the sand, grinding against each other and forming into walls, passageways and stone cages.

Travelling by night, Zak Nine and Erro are following a shadowy figure until the mysterious stranger disappears into a cave. The boys decide to follow. Inside they find a maze filled with priceless gems, along with a rough band of escaped criminals. Things go from bad to worse when a squad of Alcatraz guards arrives on the scene. When the guards start shooting their laser blasters, suddenly nobody is safe! Will Zak and Erro escape the deadly storm of laser fire, or will they be trapped in the endless dark forever?

As Zak Nine and his friend Erro make their way around a strange lake, they discover an ancient golden building. The boys decide to go inside to take a closer look, but unwittingly stumble into the legendary Octagon: an underground chamber with eight mysterious doors. One door will lead the boys to freedom, but the rest lead to sinister traps and certain death! Will Zak and Erro outwit the deadly room and escape before it's too late?

Erro and Zak Nine are hiding in the Phantom Forest, a dark wood filled with giant, towering trees and dangerous beasts. The boys hide high above the ground, climbing and jumping between the tree branches. So far they've avoided dangerous creatures such as huge, hairy rats and giant, bloodthirsty spiders. But a new predator has caught the boys' scent. An enormous flying serpent chases after them and won't stop until its hunger is satisfied! How will Zak and Erro avoid becoming dinner for this deadly new monster?