She has most often been associated with the X-Men and the Hellfire Club , whom she spied upon for Professor Charles Xavier .
Sage , also known as Tessa , is a fictional character in the Marvel Comics universe .
Sage has most often been associated with the X-Men and the Hellfire Club , whom Sage spied upon for Professor Charles Xavier .
Sage , also known as Tessa , is a fictional character in the Marvel Comics universe .