This issue is a variant of From Beyond the Unknown Giant (DC, 2020 series) #1 [Mass Market Edition].
This one-shot was available first as a Mass Market Edition, available through Walmart and other retailers, and was followed by a later Direct Market Edition through Diamond. The Direct Market Edition was available several weeks after the Mass Market Edition.
The Mass Market Edition features a reprint cover, the Direct Market Edition features new cover art.
The Legion members, depictions, costumes, cruiser, and logo design are in the style of Bronze Age Legion stories.
Story is divided into three parts. Part 2: Tower of Hostages; Part 3: What Price One Batman?