Quantum is from the planet Dakkam. He is an alien super-soldier and he is part of an elite group of Dakkamites known as The Elect.
His exposure to Earth's sun helped to give him super abilities. Dakkamite scientists hoped to use this knowledge in order to create a platoon of super-soldiers by putting them in "capsules" placed near the sun. Once Quantum's treatment was finished he had gained incredible powers but the rest of his platoon had already gone.
Quantum appears in the West Coast Avengers: Sins of the Past story arc. During his search for the rest of The Elect, he came to Earth and joined the super-villain team led by Graviton. The group was set up to resemble the Unified Field Theory. Each member represents a different part. Quantum was to represent the "strong force", while Halflife represented the weak force, Zzzax electromagnetism, and Graviton represented gravity. Quantum joined the group because of Graviton's promise to help him find the rest of The Elect. The group was eventually defeated by the West Coast Avengers and Quantum left the group in search of his missing comrades.
He also makes appearances in the Quasar: Journey into Mystery storyline. During his search for The Elect, he comes across the Aquarian on Earth. The Aquarian is the original Dakkamite who discovered the benefits of being near the Earth's sun and inspired the scientist's plans to put The Elect near it. Unfortunately for the Aquarian, Quantum consider him a traitor and attempted to kill him. The Quasar saves the Aquarian by distorting Quantum's powers and trapping him using intangible duplicates.
In the Annihilation: Ronan series Quantum reappears and is drawn to the planet Gobthab Omega by Glorian. This is only a cameo appearance and does not have a role in the storyline. It is unclear if his killed during the assault by the Annihilation Wave.
-ComicVine
Key Issues & Appearances
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Significant comic book appearances featuring Quantum
