Origin

After the Space Gem chose Quantum to be its host, he was taken in by Assessor to be experimented on for the Beyond Corporation's superhuman experiments.

Creation

Quantum debuted in Miles Morales: Spider-Man #7. He was a spinoff of the Infinity Wars event, which ended with Adam Warlock imbuing the Infinity Gems with the ability to choose their own destinies. He was introduced ahead of the Infinite Destinies event that would chronicle the Gems' new chosen ones, but Infinite Destinies was delayed due to the global COVID-19 pandemic, leaving a decent sized gap between his first appearance and the publishing of the event.

Major Story Arcs

Infinite Destinies

After Quantum came into contact with the Space Stone, he sought out Assessor, an artificially intelligent analyst, whose purpose is to test the capabilities of select superhumans. He went to work as an enforcer for the Assessor in exchange for the Assessor figuring out a way to remove the stone from him.

The Assessor used Quantum's abilities to trap Miles Morales and measure his abilities. After Miles is rescued by his dad and uncle, he confides in Iron Man what happened, causing Iron Man to try and shut them down. Iron Man succeeded where Assessor failed, synching his tech with Quantum's power signature and nullifying his power long enough to knock him out.

Infinity Score

As part of Black Cat's plan to assemble the Infinity Stone hosts, she gave Quantum a device that would hide him from Nick Fury, who was attempting to apprehend the hosts. Cat had a plan to bring together a few hosts to increase their power. She set up Quantum to be in close proximity to Star, so she could use her amped up powers to cure Cat's mom of cancer. Unfortunately, the hospital was a plant created by Fury, full of mercenaries. This forced Quantum to escape on his own.

Beyond

When Miles and his clone brother, Shift, were looking into Beyond leads, they found the Assessor's new hideout. The Assessor was working for Beyond creating and/or stress testing superhumans for Beyond's experiments, including Quantum. He was forced to fight Miles yet again, but when Miles found out the truth, he backed down. This show of mercy inspired Quantum to turn against the Assessor. Using his teleportation, he got Miles to the Assessor's main terminal, where he stores his A.I. There Miles was able to overload it with a venom strike, wiping the Assessor from it.

Now free, Quantum teleported away but first told Miles to check the "black doors," where Miles finds the info that he had been looking for.

Infinity Watch

Star was looking for her fellow Infinity Stone bearers so that they could figure out their destiny together. When she tracked Quantum to a coffee shop, the two bearers were confronted by Thanos who wanted the stones to help power his newly created stone, The Death Stone. Thankfully, they were saved by a future version of Overtime whom informed them where his present version was hiding.

After they met up with Overtime, the presence of the other stones lured them to Coney Island where the remaining stone bearers had already assembled (Colleen Wing, Multitude, and Apex). There, they were confronted by Thor and Captain Marvel, who had been led to the meeting by Phil Coulson, recently resurrected by the Death Stone. In such close proximity to each other, their power got the attention of Thanos. He took out the stone keepers one by one, retrieving their power sources. Using his own portals against him, Thanos swiped the space stone from Quantum.

Luckily, Overtime managed to trap Thanos in a time bubble, creating a paradox that would destroy the universe. In order to preserve it, Thanos was forced to give back the stones, while Overtime turned back time and resurrecting the stone bearers. Together, they became the new Infinity Watch and teleported away.

Sticking Together

Since the current stone-bearers decided to stick together, Overtime designed a secret headquarters that Star willed into existence. A crisis alert sounded, sending the team to New York, where they came face to face with beings from another universe, called The Apeiron. They were stone-bearers from an alternate universe which have been travelling the multiverse stealing alternate infinity stones. The Watch learned this from Avery Zavala, a former stone-bearer from a universe already victimized by the Apeiron. After fighting off the Apeiron, Avery started to fight the Infinity Watch to steal their stones for himself. Once he had each stone installed on his special sword, Star grabbed the store and willed a new reality into existence. Quantum was reimagined as a delivery man.

Powers

Space Stone: Quantum is able to manipulate space, teleporting and opening portals. He also has a series of a open spaces as part of his physical person.

• Infinity Circuit: The closer he is to other Infinity Hosts, the stronger he becomes. "Powered by the user's mastery of Power. Can allow teleportation through space"