| # | Air Date | Episode Name | Watched? |
|---|---|---|---|
| E1 | Aug 18, 2025 | ||
| E2 | Sep 22, 2025 | ||
| E3 | Sep 29, 2025 | ||
| E4 | Oct 06, 2025 |
Horizon has maintained a steady Annual rhythm for 60 years, typically returning in January. As one of the longest-running science programs in television history, it has surpassed the massive milestone of 1,200 episodes since its inception in 1964. The series has served as a foundational cornerstone for BBC Two, establishing the network's global reputation for high-quality, long-form scientific documentary filmmaking. Over the decades, its format has evolved from a strict weekly broadcast to a more flexible schedule of high-impact specials and thematic series that anchor the network's educational mandate.