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.
Where to Watch The Monster of Phineas-n-Ferbenstein
Cast of The Monster of Phineas-n-Ferbenstein
Vincent MartellaPhineas Flynn (voice)
Thomas Brodie-SangsterFerb Fletcher (voice)
Ashley TisdaleCandace Flynn (voice)
Caroline RheaLinda Flynn-Fletcher (voice)
Dee Bradley BakerPerry the Platypus (voice)
Alyson StonerIsabella Garcia-Shapiro (voice)
Bobby GaylorBuford Van Stomm (voice)
Dan PovenmireHeinz Doofenshmirtz (voice)
Jeff 'Swampy' MarshFrancis Monogram (voice)
Maulik PancholyBaljeet Tjinder (voice)
Richard O'BrienLawrence Fletcher (voice)
Kelly HuStacy Hirano (voice)
Mitchel MussoJeremy Johnson (voice)
Tyler Alexander MannCarl Karl (voice)
Malcolm McDowellGrandpa Reg (voice)
Jennifer GreyAdditional Voices (voice)
Jane CarrGrandma Winifred Fletcher (voice)
Jeff BennettAdditional Voices (voice)
Candi MiloAdditional Voices (voice)
Zac MoncriefDirector
Mike DiederichWriter
Jon Colton BarryWriter
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