This article is about the Vulcanoid Rigellians. You may also be looking for the Rigellian Chelons, or the Rigelians.

The Rigellians are a Vulcanoid race apparently indigenous to Rigel V. (TOS novel: Mind Meld; Star Trek: Pendragon)

Like the Mintakans and the Debrune, Rigellians are thought to be another offshoot of the parent Vulcan species with only minor genetic drift (like the Romulans); thus their blood chemistries and neurology. Rigellians also suffer from the neurological disease Tuvan Syndrome. (TOS: "Journey to Babel", DS9: "Inter Arma Enim Silent Leges")

In the mid-2260s an experimental chemical stimulant designed to speed up the reproduction and replacement of copper-based blood in the bodies of certain species was developed. This drug was successfully tested on Rigellian test subjects but it still had problematic side effects, including placing a tremendous strain on the spleen and the liver. With the assistance of Spock, Doctor Leonard H. McCoy found that this drug was a viable treatment for producing Vulcan T-negative blood. (TOS: "Journey to Babel")

In 2293, the USS Enterprise-A visited the Rigellian city, Ancient Grace.

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