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Phineas and Ferb S03E45, Cranius MaximusS03E45

Phineas and Ferb · Season 3

Phineas and Ferb season 3 episode 45: Cranius Maximus

Aired 4 May 201211 minRated TV-G

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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.

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Availability checked 16 November 2026.

What happens in “Cranius Maximus”

When Baljeet becomes concerned that he is losing his mental edge, the boys invent a cerebral stimulatory hat, or "Brain booster," to help him. But when the hat exceeds expectations and makes Baljeet exponentially smarter, he suddenly views everyone else as beneath him and becomes a threat to civilization by taking Earth's atmosphere and bringing it to the moon. Meanwhile, Dr. Doofenshmirtz plans to use his "Key-Find-Inator" to collect all the keys in Danville in hopes that it will lead to the Key to the City.

Episode summary: TMDB.

Before you watch

  • It is episode 45 of 62 of season 3, so watch episodes 1 to 44 first.
  • It runs about 11 minutes.
  • Directed by Jay Lender, written by Mike Diederich, Scott D. Peterson 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
Mike DiederichScott D. PetersonBernie Petterson

Credits: TMDB.

More from Phineas and Ferb Season 3

Previous · S03E44The Mom Attractor4 May 2012Next · S03E46Agent Doof11 May 2012
  1. E01
  2. E02
  3. E03
  4. E04
  5. E05
  6. E06
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  45. E45
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  48. E48
  49. E49
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  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.