Plot summary
The family, stranded in the ghost town, seeks help by starting a signal fire. Zachariah (Jim Backus) returns with Peter, Mike, and the car. Mike has convinced Zachariah they are not stealing his claim. The family heads to the Grand Canyon. There, they ride mules down into the canyon, and Cindy and Bobby notice a Native American boy. They follow him, but get lost. The others frantically search for Cindy and Bobby.
Credits
Adapted from Wikipedia contributors, List of The Brady Bunch episodes. HTML formatting and reference markers removed.