"You think this is hard? Try guest-starring on Phineas and Ferb! That's hard!" Although the curmudgeonly Sue Sylvester may not be yelling this to her Cheerios on Glee any time soon, her award-winning alter ego Jane Lynch can certainly say it, as she- alongside many other top-name stars- will be providing their voices to the Disney series as it enters its third season, as reported by Variety. Although some of these guests some of us have already known about, including Ms. Lynch and fellow award-winning TV funnywoman Tina Fey, Variety reveals additional top-name guests who will show up, including Michael Douglas (Wall Street), who will appear alongside his real-life son, Joan Cusack (two-time Oscar nominee and voice of Jessie in the Toy Story movies), celebrity chef Jamie Oliver, Michael J. Fox (Back to the Future), and Anna Paquin- the latter of whom will pay tribute to their famous somewhat-supernatural past roles- Fox was a basketball player-turned-Teen Wolf, while Paquin is a waitress who encounters vampires and other unusual folks on True Blood. It seems the wunderkinder of summer vacation have surprises- and stars- up their sleeve when they return next month.