A delivery truck turns a corner too quickly and unknowingly tosses out a crate that rolls down the hill and opens in front of the Everett family dog Waldo. It is a box of a natural history museum's dinosaur bones. A gopher has taken out some of Nanny's (Juliet Mills) rose bushes. Waldo hides one of bones in a gopher hole, which Hal (David Doremus) finds and takes to his dad Professor Everett (Richard Long). He tells Hal to see a paleontologist, and he visits the museum to talk with Dr. Charles Walters (the great Jim Backus- "Mr. Howell" from "Gilligan's Island", "Mr. Magoo"). Dr. Walters says it's a dinosaur bone and brings two students to dig up the Everett's backyard. Hal and Butch (Trent Lehman) decide to sell tickets to neighborhood kids for guided tours of the excavation. Prudence (Kim Richards) sells lemonade. The professor is upset by the children's actions. Waldo brings back all sorts of bones overnight and buries them in the backyard where Dr. Walters exclaims it's the biggest discovery since the La Brea Tar Pits. When he consults Dr. Lois Hire (Diana Chesney) they find a discovery that leaves the Everett family in hot water. A nice little episode with light comedic moments.