On Earth 45, Superman was a thought-experiment gone wrong. Altered by a megacorporation to maximize its appeal, it has become Superdoom. The being was let loose on the Multiverse, robbing multiple worlds of their Superman.
After a trip to Tibet, Clark Kent and his friends Lois Lane and Jimmy Olsen built a machine utilizing sound vibrations to turn thoughts into reality, and brainstormed a possible use for it - creating a thoughtform named Superman, "a thought-powered redeemer capable of saving the world". Unfortunately, they had to sell the device and the idea to Overcorp, a business entity with a secretive CEO, who took the Superman concept and twisted it into something at once more brutal and simultaneously "toyetic" in order to achieve maximum public appeal - Superman, the Last Knight of Tomorrow, better known to its victims as Superdoom.
A self-described "killer franchise", Superdoom wasted no time in becoming the preeminent superhuman of its world. Its distinctive logo became a global phenomenon, a popularity used by Overcorp to effectively take control of the planet. Superdoom itself, motivated by its corporate directives to eliminate all possible forms of competition, entered the Bleedspace, both to hunt down its creators (who had learned that their machine allowed transportation between universes, and had fled in search of help), and to slaughter all other Supermen.
After ravaging countless parallel planets and butchering (and in at least one case subsequently devouring) numerous Supermen and Superman-analogues, including Optiman of Earth 36 and the Chibi Superman of Earth 42, it finally tracked its creators down to Earth 23, where it killed Jimmy and mortally wounded Clark. However, it found itself opposed by E-23's Superman, who with the help of Lex Luthor managed to temporarily strand it between universes before it could do any more harm.
Superdoom was ultimately summoned to Prime Earth by an unwitting Lex Luthor under Vyndktvx's direction as a final doomsday weapon against Superman alongside the other members of his Revenge Squad. After a brutal struggle, Superman overcame the monster, which upon defeat transformed into a bomb that Superman managed to deposit on the dark side of the Moon before detonation, seemingly annihilating Superdoom once and for all.
- Superhuman Strength: Superdoom's strength is variable, based on the collective belief in the people of the Multiverse in what it represents: by the time it reached Earth 23, its strength is approximately equal to that Earth's local Superman, Calvin Ellis, matching him blow for blow and ultimately overpowering him.
- Size Alteration: A living franchise that "gets bigger and bigger the more you think of it", Superdoom increases in size and strength as more people come to believe in what it represents.
- Energy Projection: Superdoom has been shown to emit beams from its eyes capable of harming Superman.
- Vulnerability to Kryptonite: Superdoom is vulnerable to Kryptonite, even that outside his native universe (as demonstrated by its vulnerability to a "K-Blast" attack by Earth 23's Lex Luthor).
Armor: Shields Superdoom from Kryptonite attacks.
Superdoom uses Transmatter Cubes to travel between parallel universes.
- Unlike most other versions of Superman, Superdoom does not require yellow sunlight in order to recharge its powers - it considers this necessity of its counterparts a weakness.
- Strangely, it is still vulnerable to Kryptonite despite not being born on a Krypton, assuming one exists in its universe at all. Perhaps this is due to its nature as a living thoughtform of the "Superman" idea, therefore sharing the same vulnerabilities as the other incarnations.
- Superdoom's origin as a work of fiction is symbolized by the fact that he has three fingers and a thumb on each hand.
- 9 Appearances of Superdoom (Earth 45)
- 2 Images featuring Superdoom (Earth 45)
- Quotations by or about Superdoom (Earth 45)
- Character Gallery: Superdoom (Earth 45)
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