With their camp threatened by a murderous tiger, Jane sees a chance for gender equality, while Gary invents - underwear. Also, they discover fire.

For the first time in history, the camp has the morning off from hunting and gathering. The possibilities for human achievement are endless. So they discover alcohol and get hammered.

After a rainstorm soaks the campsite, Jane leads a group, including a woefully unprepared Gary, on a dangerous quest to find dry wood. This leaves Marsh with a captive audience, and a chance to share the greatest story ever told.