Find the word definition

Wikipedia
Servalan

Servalan is a fictional character in the BBC science fiction television series Blake's 7, played by Jacqueline Pearce (in the new B7 audio series, Servalan is played by Daniela Nardini). She was the principal villain of the series. Her creator Terry Nation originally intended her to make a single appearance but she finally appeared in all four series, the only guest character to do so.