|Era of origin||2300 A.D.|
Rx-xR can be found in Lab 32 in 2300 A.D. in Chrono Trigger. He is a robot and the Race Log Keeper. He records the player's top race scores when the player decides to race Johnny, but only if Crono has the Race Log in his possession.
While passing through on their way to the Sewer Access, Rx-xR records Crono's race time.