In Alaska, the ruins of a massive compound point to eerie evidence of an apocalyptic mystery. New discoveries reveal why this strange marvel was built in the snowy wilds of the Last Frontier. Stories: 1) Buckner Building, Whittier, Alaska, USA; 2) Expo '92 Site, Seville, Spain; 3) Siegfried Line, Germany; 4) Red Star Train Graveyard, Budapest, Hungary
| Name | Type | Role | |
|---|---|---|---|
| Tom Williams | Producer | ||
| Luke Wales | Producer | ||
| Luis Pérez | Guest Star | Self - Innovation Manager, STP Cartuja | |
| Jim Meigs | Guest Star | Self - Author and Journalist | |
| Lynette Nusbacher | Guest Star | Self - Military Historian | |
| James S. Corum | Guest Star | Self - Military Historian | |
| Claire Barratt | Guest Star | Self - Engineer | |
| Michel Baert | Guest Star | Self - Tour Guide, Siegfried Line | |
| Rob Bell | Guest Star | Self - Engineer and Adventurer | |
| Joe Cooper | Guest Star | Self - Former Bristish Commercial Consul | |
| Sándor Tibor | Guest Star | Self - Hungarian Engineer | |
| Brenda Tolman | Guest Star | Self - Local Resident, Whittier, Alaska | |
| Andrew Gough | Guest Star | Self - Historian and Author | |
| Sascha Auerbach | Guest Star | Self - Historian | |
| Henry Scott | Executive Producer | ||
| Neil Laird | Executive Producer | for SCIENCE CHANNEL | |
| Bruce Burgess | Executive Producer | ||
| Luke Wales | Director | ||
| Tom Williams | Director |