Disoriented teens Adam, Mira and Kai are strangers who wake up in a room with no doors or windows. How did they get there? And how will they escape?

The kids meet the Four Horsemen of the Apocalypse. While Mira tries to help Death's sick steed, Kai puts his mechanical skills to work.

Adam, Mira and Kai spy a lighthouse and send out a distress signal -- only to stumble into a bizarre new world inhabited by a mysterious being.

On a mission to find the Ishibo, Adam battles a fearsome demon monk. Kai's cry for help summons That Weird Guy, who delivers a warning.

The friends wander into a spooky ghost town, but they soon realize they're not alone. Can they trust their new acquaintances?

Separated from Kai and the others, Mira and Adam must solve an old man's riddle. Adam thinks he's spotted a clue about where they are.

After battling an ice monster, Adam, Kai and Mira weigh whether to help the other kids, then find themselves stranded at sea.

The friends land on an island overrun with mutant spider-people. Adam needs help, and their time is quickly running out.

Adam, Mira and Kai dodge old enemies as they race to find the tree and discover that a powerful foe guards their next destination.