Grey, originally black
Human - Nu-gene active
U.S. citizen with a criminal record
Cabbot Stone (son)
John Annex Stone (son)
Kaitlin McManus (daughter)
Michael Stone's life started out as a normal life with a wife and two kids. What happened to his has not been revealed, but at some point it caused the death of his wife .
In the early seventies Michael Stone created New Haven in the northern Canada. New Haven was a refuge for nu-gene active to get away from the world .
When Quantum broke out of prison  he went to New Haven only to find that the place had been destroyed and the inhabitants killed . The killers were revealed to be the Brotherhood of Man, whom he destroyed, resulting in his own recapture .
When the Keep attacked Earth, Quantum was freed and became part of Earth's defense . Quantum was the one to defeat Imperion the leader of the Keep and stop their harvest of Earth's nu-gene active. Having defeated Imperion, Quantum was now the leader and went into space with the Keep when they left the Earth .
Skills & abilities:
Quantum can tap into the Earth's magnetic field, giving him flight and super-strength .
Rob Liefeld's part of the Image universe
Supreme (vol. 2) #10 (1994)
Country of origin:
1: Bloodstrike (vol. 1) #10
2: Brigade (vol. 1) #8
3: Extreme Destroyer Epilogue #1
4: Knightstrike (vol. 1) #1
5: Team Youngblood (vol. 1) #7