A Gate is a hyperdimensional, space-time distortion that allows people to move through time. The first Gate in Chrono Trigger is opened by the Telepod interacting with Marle's Pendant, sending her into the past. Crono uses the same means to follow her. Lucca creates a Gate Key that can open any Gate, enabling the group to travel through time at will. More Gates are discovered as the group continues their journey, set up by some unknown entity to put them on course to fight with Lavos and prevent the destruction of the world. After obtaining the Epoch from Belthasar in the Future, the Epoch's Time Gauge locks onto the temporal coordinates of all the Gates, allowing it to travel to any time period accessible by the Gates (Prehistory, Antiquity, Middle Ages, Present, Apocalypse, Future, End of Time).