The TV series LOST initiated a wide-ranging academic debate, centered on its narrative and temporal complexity and also addressing the fact of a massive expansion into other media while consequently transgressing established genre categories. This transgressions and expansions pose the essential question about the status of the original medium television within recent multiple media configurations. Can LOST be regarded as a symptom of television in the process of media change? What is the relation between LOST´s temporality and that of television in general? And how can LOST be understood as a phenomenon of mediatized worlds?The editors are members of the project "TV Series as Reflection and Projection of Change" which is part of the DFG Priority Program 1505 "Mediatized Worlds".