Prior to the year 2267, the Federation conducted several surveys of the planet and discovered that there were no signs of life located there. In 2267, Korob and Sylvia established themselves on the planet for the purpose of learning about the Federation. When the USS Enterprise visited the planet, Korob and Sylvia engineered the capture of several crewmembers and used a variety of "magical" tricks on them such as voodoo, to keep the Enterprise crew on the planet.
However, Sylvia quickly became infuriated with the sensations of taking humanoid form, and became dangerously irrational. In order to defeat the aliens and escape the planet, Captain James T. Kirk destroyed their transmuter, and the aliens quickly perished. (TOS episode & Star Trek 8 novelization: Catspaw)
- The planet was referred to as Pyriss VII in Assignment: Eternity.
Pyrix VII was noted on star charts of the galaxy's explored regions in the 23rd and 24th centuries, in an area of the projection also containing Beta Lyrae, Capella and Alpha Centuri. (TOS movie: The Undiscovered Country, TNG episodes: "Conspiracy", "The Measure of a Man", "The Emissary", "The Mind's Eye", "The Game", DS9 episodes: "In the Hands of the Prophets", "Cardassians")
- The planet was referred to as Pyrix VII in the TNG background artwork explored galaxy chart.
|explored galaxy map|
|states and organizations||First Federation • Tholian Assembly|
|regions||Kling • Romulan Neutral Zone • Sarpeid|
|stars and systems||Aldeberan • Alpha Carinae • Alpha Centuri • Alpha Majoris • Beta Aurigae • Beta Geminorum • Beta Lyrae • Beta Niobe • Beta Portalan • Capella • Deneb • Eminiar • Fabrina • Gamma Trianguli • Ingraham B • Omega Cygni • Orion • Pallas 14 • Phylos • Regulus • Rigel • Sirius • Sol • Talos • Tau Ceti|
|planets and planetoids||Alfa 177 • Altair VI • Andor • Arret • Ariannus • Babel • Benecia • Berengaria VII • Camus II • Canopus III • Daran V • Gamma Canaris N • Holberg 917G • Janus VI • Kzin • Lactra VII • Makus III • Marcos XII • Marnak IV • Memory Alpha • Mudd • Omega IV • Organia • Pollux IV • Psi 2000 • Pyrix VII • Remus • Romulus • Theta III • Vulcan|