When Mississippi salesman Alexander Botts learns that his fiancée, Sally Blair, will not marry him unless he sells a big, important product, he dashes off a letter to the Earthworm Tractor Company. Impressed by his initiative, H. J. Russell, the company head, hires Alexander, hoping that he will be able to close a big sale with a difficult client. On his way to demonstrate the tractor to prospective customer Mr. Jackson, Alexander stops to help Mabel Johnson, whose car is stuck in the mud. While attempting to free her car, Alexander destroys a bank window and a taxi. Mabel suggests that he sell her father Sam a tractor, but adds that he has thrown out all previous tractor salesmen. Mistaking the name Johnson for his actual prospect Jackson, Alexander persuades Johnson to take a ride on his tractor. As he knows nothing about tractors, Alexander loses control of the machine and cuts a path of destruction through the swamp. Luckily, Jackson has been watching and is so impressed that he orders several tractors. Upon learning that the Johnsons are having their house moved, Alexander decides to surprise them by moving it himself with the tractor. Unfortunately, the Johnsons are having dinner at the time and believe that they are experiencing an earthquake. Discouraged, Alexander finds that Sally has married his rival, Emmet McManus. Delighted by this turn of events, Alexander goes back for Mabel, who, believing that he loves someone else, has run away to Chicago. Alexander goes to Chicago and, after calling every Johnson in the telephone book, finds Mabel working the switchboard in his hotel. He follows her back to Mississippi and takes her father on another wild tractor ride. Johnson is furious until he realizes that a dynamite explosion nearby has improved his hearing. He orders his tractors from Alexander, whose career is thus assured.