The Doomsday Saga sprawled across the four monthly Superman titles for the better part of a year, clearly too long to successfully adapt as part of the DC Animated Universe series of films. When The Death of Superman was announced, everyone knew a second film would follow and sure enough, viewers were treated to The Reign of the Superman. The 1992-93 storyline was streamlined and revised to be fit into the animated continuity, so characters who weren’t around at the time, are here now.
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Warner Home Entertainment has edited the two films together into a 2:46 and has released it as The Death and Return of Superman released in a variety of formats including the nifty 4K Ultra HD Limited Edition Gift Set. The 4K gift set comes with Superman: Doomsday as a bonus 4K disc.
As noted in reviews of the two films, it does a reasonable, but not perfect,