A mysterious space craft is discovered underground by Project Applecore, a program by Lex Corp. They accidentally unleash the ultimate destructive alien known as Doomsday from within. Doomsday kills all of Applecore's workers and then proceeds to rampage across across Kansas till it reaches the city of Metropolis. Superman races in to stop Doomsday's killing spree in the city but finds the creature an even match. Giving it his all, Superman throws everything he can at the creature till ultimately sacrificing himself in a move that effectively kills both Doomsday, and himself.

Superman's funeral is held as the world mourns. But a week or so later, a hand bursts out of Superman's grave as the man of steel apparently takes to the sky again and resumes hero work. But things are off about him as he seems... different and also seems to completely have forgotten he was in a romantic relationship with Lois Lane.

It is revealed through her investigative reporting work that this Superman is actually a clone of Superman created by Lex Corp who has Superman's body in Lex's company. But then Superman's body vanishes, as the robot at the Fortress of Solitude is able to track him down once it figures out Superman is not actually dead, but in a healing coma, where his heart beats once every 17 days. While Superman struggles at his North Pole hideaway to regain his strength, the Superman clone starts taking things too far with the law and even begins killing off super villains, starting with Toyman.

The government turns on this Dark Superman, not knowing he's a fake, and so the real Superman has to race to the rescue once more but while only partly recovered to battle this false clone through the city.

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Superman/Doomsday mistake picture

Continuity mistake: In Metropolis on the bridge, Doomsday grabs a soldier and breaks his neck and skull. In that shot, the soldier's arms are inside Doomsday's hand and his hair is a light brown or gray. But then when the shot changes as Doomsday begins to throw the soldier to the side, the soldier's arms are suddenly outside of Doomsday's hand, and his hair is now black. (00:17:10)

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More mistakes in Superman/Doomsday

Superman: The Antarctic camouflages Kryptonian crystal tech far better than cacti, but next time you catch a chill, give me a holler. I'll warm you.
Lois Lane: You wouldn't use your heat vision on me, would you, Superman?
Superman: No, just the x-ray.
Lois Lane: You're bad.

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Trivia: After Doomsday breaks out, he jumps at the laser drill rig and punches through the driver compartment and rips out the guy inside. When he throws him, this guy cries out in the iconic Wilhelm scream. (00:10:20)

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More trivia for Superman/Doomsday

Question: So how exactly did Doomsday's ship get buried so deep? On the movie the Project Apple Core workers say they discover it's "before Christ deep", but don't specify exactly how old. And they are 2 miles down at the time. Lex Luthor interprets the alien hologram as a warning and says that an alien race must have trapped Doomsday here because they could not kill it. And later the robot at the Fortress of Solitude identifies Doomsday and tells Superman what it is. I know there are several differences between the film and the comics it's based on. Are there differences in how Doomsday got there and how is it so deep?

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Answer: In the comic book, Doomsday was put in a strait-jacket, strapped in metal bondage and placed in a cube like metal prison buried deep in the earth. It took him centuries just to break the bonds, then spent more centuries just punching his way out. With earthquakes, volcanoes and other natural disasters those events could shift Doomsday's prison to the surface.

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