TV Horizon - 2021 Horizon - 2021 7.516/10 by 32 users Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Details Casts Posters Images Title Horizon - 2021 Alternative Titles BBC Horizon First Air Date 1964-02-04 Last Air Date 2024-07-22 Number of Episodes 1169 Number of Seasons 60 Genres Documentary, Networks BBC Two, Casts Plot Keywords , Episodes List Horizon Season 58 :Episode 1 Feast to Save the Planet Feast to Save the Planet 2021-01-04 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 58 :Episode 2 The Secret Science of Sewage The Secret Science of Sewage 2021-03-18 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 58 :Episode 3 Dolly: The Sheep That Changed the World Dolly: The Sheep That Changed the World 2021-11-23 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 58 :Episode 4 The Vaccine The Vaccine 2021-07-08 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.