It is a bright, sunny day, and Mr. Gumpy decides it is the perfect weather for a relaxing ride in his red motor car. He barely makes it out of his lane before all of his friends ask to come along. The children, a rabbit, a cat, a dog, a sheep, some chickens, a calf, and a goat all want a seat. Mr. Gumpy kindly agrees, and they squash tightly together into the car. At first, they chug happily across the grassy fields. But the summer weather suddenly changes, and a heavy rainstorm begins to pour down. The ground turns into slippery mud, and the tires get completely stuck. Mr. Gumpy needs volunteers to help push the heavy car out of the muck, but everyone has a silly excuse for why they cannot help. Find out what happens when this crowded, muddy road trip requires everyone to finally step out and work together.