McGarrett and the team must find out who is behind a series of ecological stunts, when it is feared that a company executive will be their next target.
| Name | Type | Role | |
|---|---|---|---|
| Bill Stratton | Writer | ||
| Norman Tang | Guest Star | ||
| Mitch Mitchell | Guest Star | ||
| Ted Scott | Guest Star | ||
| James Canada | Guest Star | ||
| Baird Miller | Guest Star | ||
| Scott Stambler | Guest Star | ||
| Herb Jeffries | Guest Star | ||
| Fred Titcomb | Guest Star | ||
| Nephi Hannemann | Guest Star | ||
| Don Lev | Guest Star | ||
| Ed Fernandez | Guest Star | ||
| Maura McGiveney | Guest Star | ||
| Fred Ball | Guest Star | ||
| Richard Morrison | Guest Star | ||
| Clarence Garcia | Guest Star | ||
| Michael O'Herlihy | Director |