Sevrin was a Muto living in the wastelands.
Sevrin saved Sarah Jane Smith from Gerrill, another Muto, who wanted to kill Sarah as she was a "Norm" and under Muto law "All Norms must die."
He was captured along with her by a two-man Thal patrol who, having shot dead the escaping Gerrill, needed expendable labour for the Thal rocket launch.
After being rescued from the Thal dome, Sevrin aided the Fourth Doctor's companions and Bettan in resistance against the Daleks. (TV: Genesis of the Daleks)
Behind the scenes
- Stephen Yardley is credited as "Sevrin, a Muto" on the sleeve of the Genesis of the Daleks LP.