Prehistoric Planet 1x5 Forests Season 1 Season 0 5 EpisodesSeason 1 5 Episodes 1x1 - Coasts 1x2 - Deserts 1x3 - Freshwater 1x4 - Ice Worlds 1x5 - Forests A journey through an underground cave in North America turns perilous when a young Triceratops is separated from its mother.