Sage
Comic book character
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Sage, also known as Tessa, is a character appearing in American comic books published by Marvel Comics. She has most often been associated with the X-Men and the Hellfire Club, whom she spied upon for Professor Charles Xavier. Wikipedia
Powers and abilities: Telepathy, Data, and Eidetic memory
Played by: Hayley Lovitt
Notable aliases: Tessa and Tessa, Lady Tessa, Diana Fox, Britannia
Alter ego: Tessa
First appearance: The Uncanny X-Men #132 (April 1980) (as Tessa); X-Men #109 (February 2001) (as Sage)