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Phineas and Ferb S04E21, One Good TurnS04E21

Phineas and Ferb · Season 4

Phineas and Ferb season 4 episode 21: One Good Turn

Aired 9 August 201311 minRated TV-G

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Where to watch Phineas and Ferb Season 4 in Australia

Phineas and Ferb season 4 is streaming in Australia on Disney+ (subscription, listed for the whole show). You can also buy it on Apple TV from $14.99.

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Availability checked 16 November 2026.

What happens in “One Good Turn”

Candace and Stacy compete in Phineas and Ferb’s Ultimate Obstacle Course. Doofenshmirtz plans to humiliate his brother, the Mayor.

Episode summary: TMDB.

Before you watch

  • It is episode 21 of 48 of season 4, so watch episodes 1 to 20 first.
  • It runs about 11 minutes.
  • Directed by Robert Hughes, written by Mike Diederich, Jim Bernstein and Edward Rivera.

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
Robert Hughes
Writers
Mike DiederichJim BernsteinEdward Rivera
Guest stars
John O'Hurley as Roger Doofenshmirtz (voice)

Credits: TMDB.

More from Phineas and Ferb Season 4

Previous · S04E20Love at First Byte2 August 2013
S04E22Next · S04E22Phineas and Ferb: Mission Marvel16 August 2013
  1. E01
  2. E02
  3. E03
  4. E04
  5. E05
  6. E06
  7. E07
  8. E08
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  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
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  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

Every episode of Season 4Phineas 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.