Curious George gets into trouble when he boards a dump truck and spills a load of sand in the road but redeems himself when the sand blocks the getaway of jewelry thieves.
Separated from the man in the yellow hat while at a Christmas tree farm, Curious George ends up at a hospital where he delights the child patients with his own brand of tree trimming.
While on a field trip to a fire station with Mrs. Gray's class, Curious George goes off on his own and is soon at the scene of a fire, where he finds a way to be helpful.
While waiting for the man with the yellow hat to buy train tickets, Curious George causes trouble by mixing up numbers on the schedule, but he makes up for it when a little boy's toy rolls toward the tracks.
Visiting a safari-style zoo where resident animals roam freely, George is unable to resist joining them and befriends a sad baby rhino who hides until George plans a special birthday party for her.