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When Caillou plays astronauts with Leo he upsets Rosie. Meanwhile, Grandpa discovers a new planetarium is opening and there's a prize for the best space costume. Caillou is thrilled when the winner turns out to be...a surprise!
First Air Date : Sep 15, 1997
Last Air date : Apr 17, 2011
Episode : 351 Episode
Season : 23 Season
Runtime: 30:14 minutes
Studio: Teletoon, Treehouse TV
Country: Canada, South Africa
