While playing in the sand on the beach Duck and Shark discover the perfect home for Shark: a sand castle! But why does it disappear every night? When the WordFriends try to hunt down the thief, they learn about tides and waves from a singing Crab. Build a Word: "CASTLE" Duck thinks Frog doesn't want to play in the rain because Duck accidentally broke Frog's boat. But the real reason is that Frog doesn't like the rain. Duck learns all about words that end with “oat” before finally coming across a word that will allow Frog to play outside in the rain: a coat! Build a Word: "COAT"

Originally released by PBS, 2008. Streaming video file encoded with permission for digital streaming by Infobase on March 23, 2022.