We bet you didn't recognize these celebrity cameos in "Phineas and Ferb."
Top 20 Celebrity Cameos in Phineas and Ferb
Credit: WatchMojo
Duration: 23:31s
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We bet you didn't recognize these celebrity cameos in "Phineas and Ferb." Our countdown includes Tim Curry, Tina Fey, Seth MacFarlane, and more!