

Documentary
The Best Episodes of Horizon Season 42
Every episode of Horizon Season 42 ranked from best to worst. Discover the Best Episodes of Horizon Season 42!

Documentary
The Best Episodes of Horizon Season 42
Every episode of Horizon Season 42 ranked from best to worst. Discover the Best Episodes of Horizon Season 42!
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Seasons60
Season 42 Ratings Summary
"Global Dimming" is the best rated episode of "Horizon" season 42. It scored 7.7/10 based on 35 votes. Directed by Unknown and written by Unknown, it aired on 1/13/2005. This episode is rated 0.3 points higher than the second-best, "Einstein's Unfinished Symphony".