Red Chinese agent Wo Fat uses a sensory deprivation chamber to procure information from U.S. agents. Steve McGarrett, head of Hawaii Five-O, investigates the death of a close friend who appears to have drowned. Steve's knowledge about his friend and a mysterious white substance lead him into a high-level intelligence matter involving a foreign agent. McGarrett, head of Hawaii's state police force, poses as "control," possessor of the names of other agents. He allows himself to be captured and placed in the chamber; will he be able to withstand the torture?
| Name | Type | Role | |
|---|---|---|---|
| Leonard Freeman | Writer | ||
| Philip Ahn | Guest Star | ||
| Nancy Kwan | Guest Star | ||
| Andrew Duggan | Guest Star | ||
| Lew Ayres | Guest Star | ||
| Leslie Nielsen | Guest Star | ||
| Wright Esser | Guest Star | ||
| James Gregory | Guest Star | ||
| Mitzi Hoag | Guest Star | ||
| Tim O'Kelley | Guest Star | ||
| Noah Keen | Guest Star | ||
| Paul Wendkos | Director |