The Boy With the Cardboard Fort

Dotty trains Oso to drop water balloons on a target from high up in the air. But Oso goes too fast and misses the target. That's when a special alert comes in. Oso helps a boy, Wyatt, build a fort out of a cardboard box from which a new refridgerator came in. Will they be able to make the fort before Wyatt's friend Isaac comes over to play?