Mentor is the fourth planet from the sun of the Rhetor system, United Empire of Earth (UEE). Located on the far outer edge of Rhetor's green band, Mentor has a harsh, cold year-round climate that keeps its inhabitants mostly indoors. Its academically challenging universities suffer from a higher dropout rate than those on Reisse (Rhetor III) and Persei (Rhetor II). Mentor is also the site of the UEE's universal seed vaults.