Caillou and Rosie visit the library; after returning from the library, Caillou is eager to read a book about pirates; Caillou's teacher, Ms. Martin, encourages him to make a storybook out of his superhero tale. "Caillou the Librarian" - Caillou, Rosie and Mommy are headed to the library for story time. Caillou is having fun waving around his library card like its a fish and entertaining Rosie. He tells her that maybe one day she'll have her very own library card. They reach the library, but it's still a few minutes before story time. Caillou and Rosie have fun looking at a fish at a tank and then Caillou takes Rosie over to the board books. They get caught up in a picture book filled with animals and Mommy has to tell them to quiet down. Caillou decides to go look for a book about fish, but he can't seem to find a single one. A librarian named Vanessa notices his predicament. It turns out she's one reading for story time and it just so happens that the featured book is about a dolphin named Daphne. As he and Rosie enjoy the story, Caillou imagines what it would be like to be a dolphin. Afterwards, Vanessa asks if Caillou would like to borrow the book. He does, so she gives it to him. Rosie's interested in the book too. She and Caillou end up in a tug-of-war for the book and end up tearing a page. At first, Caillou is worried that he won't be able to borrow anymore books and tries to hide it. He realizes this isn't going to work and so he shows it to Mommy. After talking about it a little, they take it up to Vanessa, who is now working the circulation desk. Together, Vanessa, Caillou and Rosie tape up the book and then Caillou is able to check it out. Rosie also checks out some books and gets her very own library card. "Caillou the Bookworm" - This time, Caillou, Rosie and Mommy are on the way home from a visit to the library. Caillou has a book about pirates that he just can't wait to read. Meanwhile, Rosie really wants to play "horsey," but Mommy and Daddy ar