When Homer accidentally causes the death of Red, a famous truck driver, he and Bart take over Red's truck to deliver his last load. While they're away, Marge and Lisa buy a new doorbell. On the road, Homer learns of a long-held trucker secret: All the trucks are controlled by an auto-drive system and the drivers just hang out as the trucks drive themselves. When Homer can't keep the secret, several angry truckers try to run him off the road and kill him for violating the code of silence. Meanwhile, Marge has troubles of her own when the new doorbell malfunctions and plays the Carpenter's "Close to You" over and over again. Homer escapes his attackers and brings Red's delivery to its destination. Returning home, he discovers a mob scene outsidehis house as everyone in town tries to stop the annoying doorbell. Only Senor Ding-Dong, the mysterious and debonair dean of doorbells, can stop it with his magic touch.