The Sigma Draconis system is a star system with nine planets, three of them inhabited. It was probed by only long-range scans until the USS Enterprise entered the system in 2268 to search for Commander Spock's brain. (TOS: "Spock's Brain")

• Sigma Draconis (primary)
  • Sigma Draconis I
  • Sigma Draconis II
  • Sigma Draconis III
  • Sigma Draconis IV
  • Sigma Draconis V
  • Sigma Draconis VI
  • Sigma Draconis VII
  • Sigma Draconis VIII
  • Sigma Draconis IX

ApocryphaEdit

The Enterprise returned to the Sigma Draconis system and discovered a planet composed entirely of liquid in the Ninth UK Story Arc. It continued exploring the system in the Tenth UK Story Arc, discovering it to be a theater of warfare in the conflict between the Eldorians and the Norusians.