Grandma Sophie invites the Thornberrys to the States for Thanksgiving, but Nigel and Marianne must decline due to their deadline to film the rare Fossa. Debbie is furious and Marianne reluctantly sends the girls.
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Eliza is determined to play vet to some penguins, and misinterprets a penguins request for food, bringing the bird to a base for observation.
Donnie gets lost in the Rain Forest. As Eliza searches she realizes he may be heading home to look for any of his remaining family.