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Origin: he comes from the Injustice Universe, while Lex Luthor was in the process of creating the clone of Superman (Bizarro), he was also in the process of creating a half breed clone of doomsday, but in his infancy in the test tube Lex Luthor saw Jack as a child and didn't want him to probably die at the hands of Superman, so he made a deal with Dr. Fate who sent Baby Jack to a dimension outside the DC multiverse, and thats when he ended up in the Invincible Universe.
Powers:
Adaptation: he evolves faster then any being ever could, whether it different types of climate or when in battle, his Adaptation is not as strong as doomsdays yet, but it will as he grows up.
Accelerated healing: he can heal faster then others, but depending on the injurys he gets it will take time for him to fully heals.
Self Sustenance: he doesn't need food to survive, he is practically immortal, he doesn't need to sleep either.
Controlled Bone Growth: he can make bone like spikes come out of his body in different places, or harden the hair to make it as hard as the bone spikes.
Super Strength: maybe not as strong as doomsday but still strong enough to go head to head with most people or monsters, he can equal Invincible, and with his Adaptation he can grow stronger.
Super Speed: he can't fly, but on foot he can run faster then a Lockheed SR-71 Blackbird, which can reach speeds of Mach 3.3, that's more than 3,500 kph or 2,100 mph, he can go faster if he wants to.
Super Leap: he can jump really high up, he can reach the to of mount everest in a single jump.
