Caillou is so excited for Christmas, but his hopes are crushed when a Christmas Eve snowstorm hits town, causing a power outage.

Caillou imagines becoming a great knight who protects the kingdom while learning that friends and family make the best allies.

After Rosie bullies Caillou, he embarks on an imaginative adventure of epic proportions: confronting a giant who shows up at an important car race and causes chaos.