Billy, Amos, Janna, and Lulu find themselves in another dimension after getting on the "Cosmic Wobble," a ride at Worlds O' Wonder amusement park. They encounter the Luman, beings from a third dimension, and create the world of Septeluma, a middle world where Lumans and Humans can interact. The young teens are told a rift has occurred in the Lumans' home universe that threatens to extinguish all life. To close the rift, each of the four must travel back to Earth into their ancestral past and complete dual quests. But before they can time travel, they must be prepared to meet the challenges of historic time. On Septeluma, they master skills in the defensive arts of kung fu, swordplay, archery, and fencing while they discover the magic and wonder of their created world.