S1·E40 The Monster of Phineas-n-Ferbenstein
Aired October 17, 2008 11 min ★ 9.0/10 · 2 TMDB votes
Synopsis
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.
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