Old One

• Appearance: Largely indistinguishable from Humans (TNG Novel: Immortal Coil)
• Homeworld: Exo III
  • Given appearance and timeframe of extinction, potentially a branch civilization of the Sargonians
• Rendered extinct by their android creations following their retreat into the caverns of Exo III (TOS: "What Are Little Girls Made Of?"; TNG Novel: Immortal Coil)
• Culture
  • Generally uninterested in interstellar travel (TNG Novel: Immortal Coil)
    • Upon the glaciation of Exo III c.500,000ya, rather than depart the planet, their civilization retreated underground (TOS: "What Are Little Girls Made Of?"; TNG Novel: Immortal Coil)