Doomsday

Long before Kryptonians inhabited their eponymous planet, it was home to a scientist of unknown species named Bertron that repeatedly experimented on an artificial being that was meant to be the most dangerous animal in the galaxy. The idea was that it was sent into battle to be killed, and then upon recreation, would become impervious to the way it was killed before. This alien, branded 'Doomsday', would break out of captivity, kill Bertron and lay waste to his lab as vengeance for experimenting on him in the first place, and then come to Earth at some point. Upon reawakening, it wreaked havoc across its entire journey across America, disposing of the Justice League before coming into contact with Superman. They engaged in a ferocious battle that trashed a good amount of Metropolis, eventually ending up in a draw that cost both their lives. Since then, after Superman’s revival, as expected, Doomsday would come back numerous other times, but was always brought down in a different way.

Bred to be the ultimate killing machine, Doomsday originated on Krypton, long before Superman's race was born. Besides giving him super powers, Doomsday’s DNA contains an innate hatred for all life.

Since killing him would be next to impossible, Superman devised a collar that allows him to control Doomsday’s movements. Doomsday now serves as a last resort weapon for the One Earth Regime.

The mainstream universe Doomsday first appears alongside the group of villains assembled by Lex Luthor to occupy the Justice League while the Joker prepares to detonate a nuke in the center of Metropolis. He appears and knocks away Superman as the other JLA members attack. Doomsday is later seen grabbing Hawkgirl's mace before being thrown to the ground by Green Lantern and Wonder Woman. He then attempts to attack Flash and Green Arrow before being taken into deep space by Superman. 

In the alternate timeline, Doomsday is used as a tool by the Regime, kept chained in the Fortress of Solitude. Regime Superman is shown to use a Kryptonian control collar to override Doomsday's actions. Upon discovering his friend Lex Luthor aided the Insurgency, Superman kills him and decides to show the world the true chaos that would arise without him by destroying Metropolis and Gotham City. Doomsday aids in the attack on Metropolis, toppling buildings one after the other with a single headbutt.

After the Regime's Black Adam and Aquaman are defeated by the mainstream Superman, Doomsday attacks Superman. To avoid causing collateral damage, Superman flies a berserk, reluctant Doomsday to the Fortress of Solitude. Doomsday then exclaims to Superman "I live to kill you", before attacking him. Superman ultimately overpowers Doomsday and throws him into the Phantom Zone.

Powers and Abilities:
Doomsday is one of the most powerful and dangerous beings seen in Injustice (2013). Created through experimental artificially induced evolution, Doomsday evolved to possess almost unlimited superhuman strength enabling him to kill with his bare hands almost anything in his path, a body and mind completely invulnerable to pain, spikes of bone protruding from various points on his body that he can use to impale his foes for devastating attacks, and the most dangerous ability of all, reactive adaptation: even if something or someone kills him, Doomsday will heal and recover, evolving further, growing stronger, making whatever killed him once incapable of killing him again.

Doomsday is so powerful and dangerous, he has defeated the entire Justice League in the past by himself and is infamously known as the monster that killed Superman, something no other adversary of the Man of Steel has ever been able to repeat. While still incredibly dangerous, the Doomsday seen in the Injustice universe possesses one noticeable weakness exploited to its fullest extent: mind control. While normally non-sentient and thus incapable of feeling fear or pain, Doomsday possesses limited sentience in Injustice, and as such, he is left vulnerable to having his mind overwritten by outside sources, leaving him under the control of someone else.

Special Moves

• Air Snatch: Doomsday grabs his foe from the air and slams them down across his shoulders before throwing them to the ground. The Meter Burn version has Doomsday throw his opponent into the air after slamming them into his shoulders and slam them back down into his shoulders again.

• Venom: Doomsday rams his opponent with his shoulder, knocking them down. The Meter Burn version adds a second strike that launches the opponent across the screen.

• Upward Venom: Doomsday performs an upward shoulder charge. The Meter Burn version has Doomsday slam his opponent to the ground with a mid-air dropkick.

• Earth Shake: Doomsday slams his fist into the ground causing a shockwave that knocks his opponent down. The Meter Burn version has Doomsday use both fists for a more powerful shockwave.

• Supernova: Doomsday leaps skyward and comes down hard on his opponent with a shoulder strike. The Meter Burn version tracks the opponent, so Doomsday always hits them.