It's a race against time when a rogue prince reluctantly teams up with a rival princess to safeguard a magical dagger that gives its possessor the power to reverse time and rule the world.

Although he has been missing for several years and the entire town thinks her father has abandoned her family, Meg steadfastly believes the best and protects her younger brother, Charles Wallace, from the brunt of the rumors and taunting. It is he, however, who convinces her to join him, the school sports star Calvin, and three unusual women on an interplanetary voyage to rescue their father from a vast evil.