The best defense is a good offense.
Start lurking over his shoulder. Watch EVERY little thing he does when you have the chance.
Let him feel your hot breath down the back of his neck and shirt. Tell him you are watching a genius at work. Annoy the life out of him.
OR, things might go better than you expect. Maybe he will keep the others in line with his presence, even if he's not their boss. There are several ways in which this can work in your favor.
ETA...response to Echoes below...True, maybe she should bring her work and coffee mug to Fat Cats' office, put her feet up, and tell him it's too busy and crowded in her cubicle to get anything done. Camp out in his space for awhile.