Time Gate

A Time Gate is a teleportation portal in Chrono Trigger.

The Millennial Fair
The first Time Gate was accidentally discovered by Crono and his friends during Lucca's Telepod demonstration at the Millennial Fair in 1000 A.D. The energy from the Telepod reacted with Marle's pendant creating the portal and sending Marle through time. Crono then followed her through the Time Gate to rescue her.

The Queen is Gone
After successfully rescuing both Queen Leene and Marle in 600 A.D., Crono and his party head back to the Time Gate in Truce Canyon. Lucca uses a device she created called the Gate Key to open up the portal manually. Together, the three of them jump back to 1000 A.D.