Here is a draft script based on the story breakdown you provided:
It was the day of the big Intergalactic Race and all the farm animals were getting ready. Oinky the pig had won the last 9 trial races in a row and was feeling very confident. However, his best friend Baah the sheep was starting to get jealous of all the attention Oinky was getting.
As Oinky was preparing his rocket buggy for the big race, he discovered that one of his tires was flat. "Oh no!" cried Oinky, "how am I going to race without a spare tire?" He searched high and low around the barn but couldn't find the spare anywhere.
Worried that he wouldn't be able