Nate the Great follows the clues to find his lost dog, Sludge, in a department store.

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.

When George and his friend the man with the yellow hat go to a party at Mrs. Gray's house, George is excited to find out that it is a costume party. After seeing his friends dressed up as astronauts, mummies, witches, and more, George gets to pick out his own costume. But George accidentally wraps himself up in a tablecloth and gets mistaken for a ghost!