Plot summary
The family travels to the Grand Canyon for their third annual camping trip. On the way, they stop at a ghost town for the night. There they are confronted by an old prospector, Zachariah T. Brown ( Jim Backus ) who fears they plan to steal his gold, and locks them in an old jail cell. The family free themselves but Zachariah has taken their car. Greg volunteers to help his father walk 20 miles (32 km) to get back to the highway for help, but Mike says now that he has come of age, he will be responsible to help Carol and Alice when dad is not around, so instead Peter helps. The episode ends with Carol worried about Mike and Peter.
Credits
Adapted from Wikipedia contributors, List of The Brady Bunch episodes. HTML formatting and reference markers removed.