Caillou learns there are many different ways to communicate. He makes friends with Robbie, a deaf boy he meets in the park, and leanrs how to communicate using sign language. After getting caught in the rain, Caillou loses his voice, but manages to find other ways to communicate until his voice comes back. Shopping with Daddy, Caillou and Rosie help to surprise Mommy by keeping a secret about her special gift. Also, Teddy won't tell the other puppets why he's sad. Gilbert and Rexy do some research and find out what Teddy needs is a hug.