Skip to content
Compare TV
Phineas and Ferb S03E08, Ask a Foolish QuestionS03E08

Phineas and Ferb · Season 3

Phineas and Ferb season 3 episode 8: Ask a Foolish Question

Aired 13 May 201111 minRated TV-G

Mark watched

Where to watch Phineas and Ferb Season 3 in Australia

Phineas and Ferb season 3 is streaming in Australia on Disney+ (subscription, listed for the whole show). You can also buy it on Apple TV from $14.99.

We may earn a commission when you sign up through our links. How we make money.

Stream (subscription)

Buy or rent

Availability checked 16 November 2026.

What happens in “Ask a Foolish Question”

When Candace discovers that Phineas and Ferb have invented a computer that can answer anything, she asks it how she can finally bust her brothers once and for all. Meanwhile, Dr. Doofenshmirtz loses the key to his latest invention, the "All Purpose-inator," and Agent P must find it before he does.

Episode summary: TMDB.

Before you watch

  • It is episode 8 of 62 of season 3, so watch episodes 1 to 7 first.
  • It runs about 11 minutes.
  • Directed by Jay Lender, written by Chong Lee, Martin Olson and Bernie Petterson.

Phineas and Ferb trailer

The official trailer for the series (no preview of this episode has been published).

Phineas and Ferb trailerPlay video: Phineas and Ferb trailer

Cast and crew of this episode

Director
Jay Lender
Writers
Chong LeeMartin OlsonBernie Petterson
Guest stars
Candi Milo as Additional Voices (voice)Corey Burton as Additional Voices (voice)

Credits: TMDB.

More from Phineas and Ferb Season 3

Previous · S03E07Moon Farm29 April 2011Next · S03E09Misperceived Monotreme13 May 2011
  1. E01
  2. E02
  3. E03
  4. E04
  5. E05
  6. E06
  7. E07
  8. E08
  9. E09
  10. E10
  11. E11
  12. E12
  13. E13
  14. E14
  15. E15
  16. E16
  17. E17
  18. E18
  19. E19
  20. E20
  21. E21
  22. E22
  23. E23
  24. E24
  25. E25
  26. E26
  27. E27
  28. E28
  29. E29
  30. E30
  31. E31
  32. E32
  33. E33
  34. E34
  35. E35
  36. E36
  37. E37
  38. E38
  39. E39
  40. E40
  41. E41
  42. E42
  43. E43
  44. E44
  45. E45
  46. E46
  47. E47
  48. E48
  49. E49
  50. E50
  51. E51
  52. E52
  53. E53
  54. E54
  55. E55
  56. E56
  57. E57
  58. E58
  59. E59
  60. E60
  61. E61
  62. E62

Every episode of Season 3Phineas and Ferb episode guide

Episode names, air dates, runtimes, stills and ratings: TMDB. Air dates are the first broadcast anywhere; where it streams is our daily Australian check.