They’ve nabbed Neil Patrick Harris and Taylor Swift. David Beckham too. Now Disney Channel’s dynamic animated duo, Phineas and Ferb, are adding some more big-name guests who will sit in those posh red chairs this season on the cartoon stepbrothers’ show “Take Two With Phineas and Ferb.”

The third season of the show has already premiered, but new guest stars slated to appear include Joel McHale, Christian Slater (hope they don't bring up "Breaking In"), Ray Liotta, Seth Green and Matthew Lillard. They join an already impressive Season 3 roster that includes Michael Douglas, Jane Lynch, Tina Fey and Michael J. Fox.

If you have kids, chances are you’ve heard of the Disney duo, two stepbrothers (one is a brilliant Brit, the other a spunky American) who are constantly looking for activities to do during their summer vacation—and constantly pondering the whereabouts of their pet platypus (who doubles as a secret agent)--under the watch of their sister, Candace.

The twosome certainly are keeping busy. They've also got a Disney Channel original movie, "Phineas and Ferb: Across the 2nd Dimension?," slated to air in early August.

--Yvonne Villarreal

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