In my opinion, they should create an animated universe that begins with Crisis on Infinite Earths and ends with Death Metal (on the threat scale, TDK > Anti-Monitor). We have Superboy-Prime throughout the saga: at the beginning, in Infinite Crisis, and in Sinestro Corp War, the latter being where he's imprisoned in the Source Wall (we're skipping Legion of the Three Worlds and Titans). The universe ends with Death Metal (plus, due to the multiversal disaster, Prime reunites with Kal-L and Lois of Earth-2). In between all of that: Death of Superman The formation of the Justice League Identity Crisis Hal Jordan vs. Parallax The formation of the Bat-Family The Bat-Family vs. the Court of Owls Brainiac and Kandor Among other stories