Sage's Sanctum

Tessa was one of Professor Xavier's prize pupils. While most of his students became members of his elite group of mutants, the X-Men, Xavier had special plans for Tessa. Her mission was of the utmost secrecy, one that could easily cost her her sanity, if not her life. She had to join London's prestigious Hellfire club - a relatively innocent gentlemen's club for the affluent - and infiltrate the more sinister secret inner circle, controlled by rich, powerful mutants bent on taking over the world.

So she became a spy for Xavier, posing as Tessa, the loyal personal assistant of Sebastian Shaw, and one of the X-Men's enemies. She was unable to prevent the seduction of Phoenix, but managed to keep a young, super-confident Psylocke from falling prey to her masters.


And then, all of a sudden, she quit the Hellfire club. But the X-Men were unaware of her stint as a double agent, and were understandably wary of their supposedly reformed nemesis.

Storm was able to look past Tessa's shadowed past, more out of necessity than trust, and invited her to join the X-Treme X-Men team. Now calling herself Sage, she has proven to be a valuable member of the team, and though some of her actions are questionable, her motives unclear, she seems to have earned a measure of trust amongst her new teammates.

Sage is the "living computer" of the group - she can recall any information she has been exposed to at a moment's notice. Additionally, she is able to calculate the odds of a particular outcome of situations almost instantly.

As such, she is in charge of information, monitoring the status of team members via their sunglasses during missions. These red sunglasses worn by the X-Treme team act as both communication devices and computer terminals.


Although Sage was trained to protect herself from even the most powerful of psychic attacks, it's unclear whether or not she has any telepathic powers of her own. As a member of the X-Treme team, the only power she has exhibited is her ability to "jump start" latent mutations, causing already present mutations to evolve further, or otherwise inactive mutations to surface.