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There’s 100-plus episodes of “Phineas and Ferb,” and no school can come along to end it. So the annual problem for the team in production is finding the actors to voice it …

This year, Michael Douglas, Tina Fey, Michael J. Fox and Jane Lynch will headline the guest cast for the third season of the Disney Channel animated hit.

Joan Cusack, Jamie Oliver and Anna Paquin will also supply guest voices this season, which premieres March 4.

Tina_feyDouglas is guesting along with his 10-year-old son Dylan in a haunted house episode, while Fox and Paquin will pay homage to their “Teen Wolf” and “True Blood” roles. Oliver, of ABC’s “Food Revolution,” will be a meatloaf competition judge.

Meanwhile, Lynch will be Phineas’ and Ferb’s sister’s boyfriend’s mother, and Fey plays an eager buyer for the headquarters of Doofenshmirtz Evil, Inc.

“Phineas” has spent three years as the most-watched animated series among kids 9-14 and ranks No. 1 on Disney XD, where it also airs, in total viewers. It airs in approximately 170 countries and 34 languages.

The season-three premiere will get a preview on Disney Channel’s subscription-based VOD outlet (via Cablevision, Time Warner, Verizon and AT&T).

Vincent Martella, Thomas Sangster, Ashley Tisdale, Mitchel Musso, Caroline Rhea, Richard O’Brien, Dee Bradley Baker, Alyson Stoner and co-creators Jeff “Swampy” Marsh and Dan Povenmire form the series’ regular cast.

Perhaps some day, one of the guest cast will appear on Phineas and Ferb’s talkshow …