The lives of five people are forever changed when a mysterious alien ship appears on the skyline over Bristol. Its intentions unclear, the disparate group attempt to flee the city and reach loved ones, but their efforts are impeded by a city in panic, looters, and the threat of military attack. As they battle to stick together, loyalties and relationships are tested, and an even larger question remains: who are these mysterious visitors and why are they here?
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Season 1
10 eps · 2015-10-05
Season 2
10 eps · 2017-10-23
Horizon airing schedule, episode calendar, cast, and synopsis. Horizon airs on .