Hawaii Five-O
The Clock Struck Twelve
TV Flash files “The Clock Struck Twelve” as hour 110 of 284 in the TV Flash guide — Hawaii Five-O (1968–1980) on CBS, season 5, episode 12, aired 1972-12-05, 60 min.
From the desk
How this hour is filed
This leaf is S05E12: listed hour 110 of 284 in the Hawaii Five-O guide, hour 12 of 24 in season 5. It aired 1972-12-05 (60 min). The listed hour before it is “'V' for Vashon: The Patriarch (3)” (S05E11). Next is “I'm a Family Crook -- Don't Shoot!” (S05E13).

Catalog log
Broadcast listing — not a TV Flash recap.
When McGarrett arrests a group of vigilante nationalists, hidden bombs at the courthouse threaten to destabilize the islands.
Viewer FAQ
Where does The Clock Struck Twelve sit in the Hawaii Five-O guide?
S05E12 is listed hour 110 of 284 — hour 12 of 24 in season 5, season 5 episode 12.
When did Hawaii Five-O S05E12 air?
The Clock Struck Twelve aired 1972-12-05 and is listed at 60 minutes.
Where should I start?
Jack Lord's McGarrett in an early location-heavy hour is the command presence: theme, waves, 'Book 'em, Danno.' You do not need the 2010s reboot to understand the original.
In the series
Why this series still plays
Book 'em, Danno — Steve McGarrett's elite unit chased crime across an islands postcard for twelve CBS seasons. Jack Lord's granite intensity, the Morton Stevens theme, and location photography made procedural TV feel like a vacation with felonies. The most whistled badge theme in the language.
The theme hits before the warrant. CBS's *Hawaii Five-O* premiered September 20, 1968, and ran through 1980: twelve seasons of Steve McGarrett's elite state police unit chasing crime across an islands postcard. Jack Lord's granite intensity. James MacArthur's Danny Williams. Kam Fong's Chin Ho and Zulu's Kono in the unit. Leonard Freeman built cop drama as tourism board and iron discipline. Morton Stevens wrote the surf-orchestra swagger that still chases you. **Book 'em, Danno entered the language. The theme…
Filed against
- Jack Lord as Steve McGarrett
Jack Lord’s Steve McGarrett made Hawaii Five-O a twelve-season postcard with felonies — granite intensity, Morton Stevens theme, Book ’em, Danno as civic punctuation. CBS procedural as vacation weather that still whistles. TV Flash files…
- James MacArthur as Danny 'Dano' Williams
James MacArthur’s Danny “Danno” Williams took the order that became a national catchphrase — Book ’em, Danno, twelve CBS seasons of Hawaii Five-O as vacation-with-felonies television. Jack Lord’s granite needed a partner who would move.…
- Kam Fong as Chin Ho Kelly
Kam Fong’s Chin Ho Kelly rode Hawaii Five-O as islands-postcard procedural muscle — Book ’em, Danno, Steve McGarrett’s elite unit, twelve CBS seasons, Jack Lord’s granite, the Morton Stevens theme, location photography that made felonies…
- Zulu as Kono Kalakaua
Zulu’s Kono Kalakaua rode Hawaii Five-O as island-unit steel — Book ’em, Danno, Steve McGarrett’s elite squad chasing crime across an islands postcard for twelve CBS seasons. Jack Lord’s granite intensity, the Morton Stevens theme,…