The 1980 eruption of Mount St. Helens was the deadliest in U.S. history. Survivor testimonies and rare images reveal the cataclysms it unleashed.
| Actor | Role |
|---|---|
 Bill RatnerNarrator | Narrator |
| DDonald A. SwansonSelf - USGS Volcanologist | Self - USGS Volcanologist |
 Dixy Lee RaySelf (archive footage) | Self (archive footage) |
| GGeorge BarkerSelf - Deputy Sheriff, Skamania Co. | Self - Deputy Sheriff, Skamania Co. |
 Harry R. TrumanSelf (archive footage) | Self (archive footage) |
 David A. JohnstonSelf (archive footage) | Self (archive footage) |
| DDorothy StoffelSelf - Geologist | Self - Geologist |
 Catherine HicksonSelf - Volcanologist | Self - Volcanologist |
| JJim ScymankySelf - Survivor | Self - Survivor |
| DDavid CrockettSelf - Retired Photojournalist | Self - Retired Photojournalist |
| JJess HagermanSelf - Helicopter Pilot | Self - Helicopter Pilot |
| RRobert Brown Jr.Self - Survivor | Self - Survivor |
| DDarald StebnerSelf - Retired U.S. Army Colonel | Self - Retired U.S. Army Colonel |