When a movie promotion stunt goes wrong, a gigantic Cubby the Cop balloon is unleashed on the city and Lieutenant Duke must stop it.

Freya McCloud, the fire chief, presents a defective propeller cap to his nephew for his birthday that takes him flying over the city. As McCloud and his team attempt to rescue him, Billy is having fun without realising the danger.

Chief Wheeler announces the formation of the Sky Police to be led by Sergeant Sam Grizzled. Rooky discovers three wanted criminals on a plane.

Police captain Tom Bennett gets a call that his wife has gone into labour, but he begins to panic as the baby is early.

Fendrich and Sinclair are the richest and most powerful people in the city, and they compete to win its tallest building contest.

It's Harl Hubbs Day and Harl decides to help the whole city but quickly discovers he wasn't prepared for Harl mania.