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Phineas and Ferb S01E40, The Monster of Phineas-n-FerbensteinS01E40

Phineas and Ferb · Season 1

Phineas and Ferb season 1 episode 40: The Monster of Phineas-n-Ferbenstein

Aired 17 October 200811 minRated TV-G

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Where to watch Phineas and Ferb Season 1 in Australia

Phineas and Ferb season 1 is streaming in Australia on Disney+ (subscription, listed for the whole show). You can also buy it on Apple TV from $9.99.

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Availability checked 16 November 2026.

What happens in “The Monster of Phineas-n-Ferbenstein”

The boys learn about one of Ferb's Victorian ancestors, who helped a scientist create a monster. Meanwhile, Doofenshmirtz recalls the story of his great-great-grandfather Dr. Jekyll Doofenshmirtz.

Episode summary: TMDB.

Before you watch

  • It is episode 40 of 47 of season 1, so watch episodes 1 to 39 first.
  • It runs about 11 minutes.
  • Directed by Zac Moncrief, written by Mike Diederich, Jon Colton Barry and Martin Olson.

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
Zac Moncrief
Writers
Mike DiederichJon Colton BarryMartin Olson
Guest stars
Malcolm McDowell as Grandpa Reg (voice)Jennifer Grey as Additional Voices (voice)Jane Carr as Grandma Winifred Fletcher (voice)Jeff Bennett as Additional Voices (voice)Candi Milo as Additional Voices (voice)Greg Ellis as Jameson (voice)

Credits: TMDB.

More from Phineas and Ferb Season 1

Previous · S01E39One Good Scare Ought to Do It!3 October 2008Next · S01E41Oil on Candace17 October 2008
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  3. E03
  4. E04
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  40. E40
  41. E41
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  44. E44
  45. E45
  46. E46
  47. E47

Every episode of Season 1Phineas 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.