The idea of the frontier--once, the geographical borderline moving further and further West across the North American continent--has shaped American science fiction television since its beginnings. TV series have long adapted the frontier myth to outer space and have explored American Wests of the future. This book takes a deeper look at the futuristic frontiers within such series as Star Trek, Firefly, Terra Nova, Defiance and The 100, revealing how they rethink colonialism, the environment, spaces of risk and utopian/dystopian worlds. Harnessing forms of speculation and the post-apocalyptic imagination, these series engage with matters of the present, from the legacies of colonialism to climate change and the increasing integration of humans and technologies. In doing so, these series question in novel ways the very idea of borders and reshape cultural binaries such as Self/Other, wilderness/civilization, city/nature, human/non-human and utopia/dystopia.