The aim of this study is to elucidate the mnemonic conditions established in the ever-increasing production and use of cultural memory in streaming media environments. To gain in-depth insight into how memories are selected for remembering and sorted for forgetting, the focus is the HBO Chernobyl mini-series. The case study of HBO?s Chernobyl is selected to qualitatively explore cultural memories across the series throughout the complexities of globally connected technologies and markets, where different cultures and languages, as well as media framings, come into play. Theoretically, the article is based on conceptualization of cultural memory studies and streaming media platforms. Methodologically, the case study is supported by the multidimensional analytical lens developed by Erll, adopted to elucidate how the cultural memory of Chernobyl is activated, mediated, and shaped by the streaming series. These three dimensions involve the intra-medial aspects of how memory is expressed within the representation itself, the inter-medial relations which designate the interplay with previous representations of the same historical event, and the pluri-medial contexts in which novels and films appear and exert their influence on cultural memory. In the three-dimension analysis, we address the construction and circulation of cultural memory from the production to the reception of the mini-series in multiple media environments and across borders, depicting the social, cultural, and political impact of streaming media productions.