Calas was a Cardassian who lived in the 24th century.

In 2361, Calas supervised the drugging of Kira Nerys in the Elemspur detention facility and her transfer to the room where Iliana Ghemor would undergo the procedure that would give her Kira's memories. Corbin Entek warned Calas (after a first injection of sedation did not work and Kira killed a Cardassian soldier) that he would know who to blame if Kira awoke a second time. (DS9 novel: Fearful Symmetry)