Phineas and Ferb: Season 2, Episode 23
What Do It Do?/Atlantis (14 Nov. 2009)
After one of Dr. Doofenshmirtz's inventions lands in the yard, the boys try to find out what it does through reverse engineering. / Phineas and Ferb and the neighborhood kids to on an epic journey to find the lost city of Atlantis.
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