"Yuletide and Redtide" is the Christmas episode and series finale of the ABC animated series Free Willy, aired as the eighth episode of the show's second and final season.
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The Eco Rangers return home in time to celebrate Christmas and Jesse receives a special gift from an unknown benefactor, a jet-ski. While trying it out, he finds out that it was actually from the Machine, who filled it with a sample of a red tide from Florida, which starts spewing the microbes into Misty Island's unseasonably warm waters causing a red tide.