Senator Harlan Henderson suffers from multiple personalities, and one side of him wants to kill himself. However, he ends up blowing up his secretary, and McGarrett uses handwriting and a diagnosis from a psychiatrist to try to crack the case.
| Name | Type | Role | |
|---|---|---|---|
| Martin Roth | Writer | ||
| Norman duPont | Guest Star | ||
| Winston Char | Guest Star | ||
| Linda Ryan | Guest Star | ||
| Seth Sakai | Guest Star | ||
| Lynne Ellen Hollinger | Guest Star | ||
| Electra Gailas Fair | Guest Star | ||
| Beau Vanden Ecker | Guest Star | ||
| Margaret Anne Mitchell | Guest Star | ||
| William Windom | Guest Star | ||
| Marc Singer | Guest Star | ||
| Melody Patterson | Guest Star | ||
| Allen Reisner | Director |