A group of friends teleport to worlds of Greek and Latin words while trying to complete a vocabulary assignment in time to celebrate their town's centennial.

In the midst of a backyard campout, ten-year-old Matt and four other children find themselves transported back into the time of George Washington and the American Revolution, where they begin to live out American history firsthand and learn the sober realities of war.

It has been two years since Joseph Harker first Walked between dimensions, met the alternate forms of himself, and formed a team to protect the Altiverse in the struggle between the vicious forces of magic and science--and now, injured, he has returned to his own dimension, bringing danger with him.

Australian teenagers Matt and Rochelle overcome their misgivings to help the other Named confront the forces of evil and chaos.

Tucker Feye and Lah Lia each hurtle through time, relating their stories in alternating viewpoints that converge at crucial moments.

Twelve-year-old Héctor Muñoz, fleeing from bullies, discovers a magical closet that not only provides him sanctuary, but also unites him with two other kids facing similar problems at their own schools, helping them find friendship and strength in each other.

Eleven-year-old Haleigh Adams paints a picture with a mysterious set of paints found and now she is stuck in a time loop, but when she realizes her parents have been keeping a secret she and her new best friend Kevin must find the source of the magic paints and the secret of the time loop before it is too late.

A woman stumbles upon a mysterious portal that links back to the Firstborn, omnipotent beings responsible for the upheaval of history and the creators of the notorious black monolith of "2001: A Space Odyssey."

When a spaceship lands in the small town of Vern Hollow in 1956, juvenile delinquent Jack Creedle and prim, studious Isadora Shumway form an unexpected alliance as they try to keep a group of extraterrestrials from stealing eccentric Uncle Bud's space travel machine.

Cass and her brother Wilbur scavenge in the ruins of a future London seeking an artifact for their Russian masters, but the search takes on a new urgency after the arrival of Erin and Peyto, strangers from afar who claim to hold the key to locating the mysterious object.