Sevrin
Doctor Sevrin was a research engineer from the planet Tiburon, renowned in the fields of acoustics, electronics, and communications. He came to reject the modern technical society of the Federation and started the philosophical movement , in search of the mythical planet Eden. When he started his movement, he was dismissed from his post. He carried the disease synthococcus novae, which required him to remain in environmentally-controlled areas. His rejection of modern technology and his inability to leave technologically-regulated areas contributed to his insanity. 

In 2269, he and some of his followers stole the space cruiser  in search of Eden. The group was apprehended by the , but managed to gain control of the starship and discover Eden. The planet proved to be toxic to humanoid life, however. Refusing to leave, Sevrin took a bite of toxic fruit and died. ()

Appendices

Background information 
Sevrin was played by actor Skip Homeier. 

A research report done by De Forest Research on  gave his name at the time as "Dr. Thomas Sevrin". This was also the name in the . His full name was given as Ton Sevrin in the novelization.

In an early version of the script, dated , Sevrin was identified as a Vulcan and given the first name Ton. This was written out of the script by the  revision.

Apocrypha  
In The Worlds of the Federation (in which the disease is the result of "unnatural" elements of bacteria and technology coming into contact with one another), his full name is given as Rota Sevrin. The book also states that Sevrin was driven insane by his inability to conduct his research, as a result of his confinement to controlled environments.

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Tiburonians
Scientists