The Sinkable Mrs. Brown

Pete Dudley, a real estate salesman, convinces Mrs. Brown that she should sell her ramshackle of a house, which causes a problem for Tim and Martin, especially in hiding the spaceship. Dudley already has prospective buyers, Edgar and Emily Graham, who would be especially interested in the garage since Mr. Graham wants to make it into a workshop. When the Graham's show up unexpectedly for their first visit, Martin has to hide the spaceship.