Caillou plays at the park, finds an old toy train, receives a gift from Grandma and creates a ""doghouse"" (cathouse?) for Gilbert.
Today, Rexy is outside pretending to be an explorer. He's already conquered ""Mount Sandbox"" and now he's going to explore the world around him. Teddy comes out and Rexy tells him that he's searching for such things as icebergs and volcanoes. He thinks he hears a volcano, but it turns out that it's actually thunder. Gilbert shows up and says that it was thunder and they'd best be getting inside. Rexy can't believe this is happening. He's not done exploring yet. It's starting to rain and it's totally spoiled his plans. Gilbert and Teddy say that rain is important. It helps to water the flowers, among other things. Rexy is still upset and sings a song about how there's nothing to do and he wasn't expecting this. Eventually, he changes his mind and decides that it could be fun to play indoors. Just then, though, the sky clears up and Gilbert and Teddy send him o
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