From John Muir in the 1860s to today's super-athletes, Vertical Frontier tells the rich and captivating saga of these free-spirited climbers whose contributions to the techniques, equipment, and ethics of mountaineering enabled them to be the first to conquer Yosemite's legendary big walls. Illustrated with spectacular footage, both old and new, shot on these granite walls, the story is told by the climbers whose artistry and relentless determination helped launch a sport now enjoyed by millions around the world, including David Brower, Warren Harding, Royal Robbins, Yvon Chouinard, Tom Frost, Jim Bridwell, Lynn Hill, Hans Florine, Dean Potter, and many others. Their epic feats range from the first ascent of El Capitan, which took 45 days over a year and a half, to today's speed climbers who complete the same route in under three hours.
| Actor | Role |
|---|---|
 Yvon ChouinardSelf | Self |
 Royal RobbinsSelf | Self |
 Elizabeth Burkner RobbinsSelf | Self |
 Warren HardingSelf | Self |
 Ron KaukSelf | Self |
 Tom FrostSelf | Self |
 Lynn HillSelf | Self |
 John BacharSelf | Self |
 Hans FlorineSelf | Self |
 John LongSelf | Self |
 Tom BrokawNarrator | Narrator |
 Peter CroftSelf | Self |
| GGary ArceSelf | Self |
| MMike CorbettSelf | Self |
| DDick DuaneSelf | Self |
| RRussell GalipeauSelf | Self |
| SSibylle HechtelSelf | Self |
| CChip JenkinsSelf | Self |
| CChris McNamaraSelf | Self |
| WWayne MerrySelf | Self |