Crono, the main character, wakes up one day, ready to go to the once-in-a-lifetime Millennial Fair. His childhood friend, Lucca, has decided to build and show off a teleportation machine for the fair. While on his way to see her invention, Crono bumps into another girl, Marle, who decides to accompany him. As a good friend, Crono volunteers to be Lucca's guinea pig, allowing himself to be moved from place to place. Marle, excited and now feeling safe, decides that she wants a turn and steps up to the machine. As Lucca and her father work the controls, Marle's necklace begins to glow, setting in motion a time travel journey of epic proportions none of them could have expected.