Caillou's grandma gets only junk mail in her mailbox, so Caillou decides to write a letter to her to make her feel better. When she sees the letter, she's in for a surprise.
| Creator | Christine L'Heureux |
|---|---|
| Actor | Claudia-Laurie Corbeil, Violette Chauveau, Nathalie Coupal |
| Country | Canada, France |
| Production | CINAR |
| Season 0(53 episode) |
|---|
| Season 1(65 episode) |
| Season 2(56 episode) |
| Season 3(53 episode) |
| Season 4(24 episode) |
| Season 5(26 episode) |
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