During a trip to the beach, Phineas, Ferb, Isabella, Buford, Baljeet and Irving try to find the lost city of Atlantis which is located in the bottom of the ocean. Then Candace and Linda enter a sandcastle building contest when Candace found out that Jeremy is the judge. Meanwhile, Doofenshmirtz creates an army of plants.
Candace and her mom, and Jeremy
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"What Do It Do?"
"Phineas and Ferb Christmas Vacation!"