For The Man Who Has Everything/Superman Annual #11 (Comic: 1985. Episode Airing: 2004 (Justice League), 2016 (Supergirl))
In case you were wondering why this thread's title involved the word "mostly" when talking about Moore's various works being adapted to film, this is why. This particular adaptation is an episode of Bruce Timm & Paul Dini's Justice League TV series (and also the Supergirl TV series...kind of), this being one of the first episodes from the third season where they rebranded the show as "Justice League Unlimited" due to the expanding roster of the Justice League after the events of the second season's finale, "Starcrossed". Not counting the direct-to-DVD release of Tales of the Black Freighter, until The Killing Joke, this was the only adaptation of Alan Moore's work to be put to animation. But before we go any further, let's talk about the comic.
For The Man Who Has Everything sees Batman, Wonder Woman and then-not-dead Jason Todd as Robin visiting the Fortress of Solitude to celebrate Superman's birthday only to find him in a dream-like state due to a strange plant called the Black Mercy. It's soon revealed that it was brought to Earth by Mongul as a part of his plans to conquer the planet, who used the plant to remove the only person capable of stopping him from the picture, the plant itself causing its host to believe that their wildest dreams are real. So it's up to the three of them to stop Mongul, with Wonder Woman barely holding him off while Batman & Robin try to figure out how to remove the Black Mercy so Superman can save the day. Also, Mongul making a lot of sexist remarks to Wonder Woman.
Of all of the various works by Moore that i've read, this is my personal favorite, namely because it's a story that gets the character of Superman: A powerful, but not omnipotent being who will do the right thing, no matter how much it hurts him. Superman is an exceptionally difficult character to write properly (see Steel, Man of/Batman V Superman as a recent example of how easy it is to screw that up), so it's all the more impressive that Moore's portrayal in this and "Whatever Happened to the Man of Tomorrow?" both managed to present a familiar, yet fascinating take on the character. In For The Man Who Has Everything, Superman's greatest desire is revealed to be something uneventful, almost boring in how simple it is: Raise a family, live a normal life on Krypton and have nothing to do with the heroic acts he's performed for the past decades. Instead of Kryptonite, the comic has Superman's weakness be his heart, in that he had to leave his wife and son and the happiness he found with them, to save his real friends from an absolute monster. Regardless of whether or not they were real, it's made very clear when he's free from the Black Mercy that Superman's feelings for them are real due to the amount of pain it caused him to leave this new family behind. It's an altogether human and tragic tale where Superman has to give up his happiness in order to do what's necessary for the good of humanity that delivers a truly heart-wrenching blow to the reader, one as equally painful as the one laid that strikes the man of tomorrow. This is also the comic that gave us the infamous "clean thoughts Batman" panel, so it has another thing going for it.
Compared to the past two movies, the Unlimited episode follows most of the same beats and even quotes direct lines from the original comic, even featuring
Superman telling Mongul to burn. There's a reason it's one of the most fondly remembered episode in all of Justice League and a high point of Unlimited's run, in large part due to the potent combination of the original source material coupled with George Newbern giving a spectacular performance as Superman that, if not his best performance for a single episode, is easily in the top 3. You really feel the heartbreak in his voice when
he tells his son that he doesn't think he's real and has to go back to the real world. It's a testament both to how faithful Bruce Timm and crew were to the characters when they crafted the DCAU and how well the story they based this particular episode on still holds up to this day.
There are minor changes like Diana giving Clark a new breed rose called Krypton instead of a replica of the city of Kandor and Batman giving him money instead of the aforementioned rose like he did in the original that don't really affect the overall story while others were likely made for time constraints. There weren't many two-parters during the third through fifth seasons that make up Unlimited in comparison to the first two seasons that comprise the original Justice League run, as Unlimited preferred telling season-long arcs like Cadmus and Luthor's attempt to become president in the third and fourth season and the formation of the Secret Society of Super Villains in the fifth. Mongul had already been established in the wretched season one episode "War World", so his introduction in the episode having slightly different dialogue to acknowledge that Wondie and Bats had already met him makes sense within the animated universe.
The only notable omission is Jason Todd, as Jason was the one who stopped Mongul by tossing the Black Mercy at him after having removed it from Batman. However, seeing as how Todd had never appeared in Batman's animated series nor Justice League up to this point, it's not exactly that big a surprise nor does giving their role to Wonder Woman for some comeuppance after Mongul's massive beating and aforementioned sexism take away from the overall strong mood of the story. It's no surprise why there was a rumor floating around that this was the only adaptation that Alan Moore liked (he just gave Bruce Timm and team his approval to adapt it) after his disappointment with the two previous attempts: It's accentuates the story's very best qualities, the tragedy of abandoning a truly human desire that would be so easy to a place to find oneself content with and doing what's right in spite of how much it would hurt to do so.
The Supergirl TV show kind of had a take on this story in "For The Girl Who Has Everything" but it goes off in a completely different direction, to the point where it feels less like an adaptation and more an original story that played up the horror elements of the plant that the original only lightly touched upon, like having Kara forget the memory of her friends. While it's not a bad episode in of itself, it doesn't capture the same visceral emotion like the original or Justice League. Needless to say that Unlimited has the better take of the two, sticking closer to the source material and being all the better for it.