The game's events reveal that Serge had died years prior in the Alternate World. As a child, he had come in contact with the all-powerful "Frozen Flame", a remnant of the all-powerful Lavos creature from "Chrono Trigger". Once Serge had made contact, it sealed off the ability for anyone else to gain access to its power. With Serge dead in the "Alternate World", the Serge alive in the Home World Serge was now necessary in the Alternate World. Kid, pulled him through the dimensions as part of Balthasar's lengthy plan to defeat the Time Devourer and free Schala from it. Meanwhile, Lynx needed his body in order to gain access to the Frozen Flame's power. While Lynx succeeds in this, resulting in the two switching bodies for a period of the game, leaving the player controlling Serge trapped in Lynx's body for the middle third of the game, if the player directs Serge to find the legendary "Chrono Cross" item and use it to fight the Time Devourer, Balthasar's plan also succeeds.