Everett Thomas was a mutant born in St. Louis, Missouri. He possessed an aura which allowed him to synch up with other superhumans in his immediate vicinity, thereby briefly gaining any powers they possessed.
The mechanical collective race known as the Phalanx had assimilated the X-Men and attempted to wipe out what was to be the next generation of mutant heroes: (Husk, Jubilee, Skin, M, and Blink). Synch had accidentally synched to Banshee, who was in the area, and had shattered all the windows nearby with Banshee's "borrowed" scream. He didn't understand how he did it, but the next thing he knew there was a slew of police officers with guns pointed at him. Unfortunately for them, the menace wasn't Everett, but the Phalanx, who attacked the officers. Luckily, he was saved thanks to the help of Emma Frost, Sabretooth, Banshee, and Jubilee. This misfit band of heroes ended up saving the other kids who were attacked by the Phalanx and, thanks with the sacrifice of Blink, they managed to escape.
Following the end of the Phalanx crisis, Everett and the other youths were all relocated to the Massachusetts Academy, where they trained to use their powers, received a formal education, and acted as the next generation of X-Men, Generation X. During his time with Gen X, he was briefly transformed into a voracious parasitic mutant by the team's arch-nemesis Emplate who wanted to destroy Synch's happy family life. Under Emplate's influence, Synch menaced his family and friends until M, who he had difficulty synching with, was able to defeat him.
When Emma Frost's sister, Adrienne, returned to America, she forced Emma to re-accept her as Headmistress. If not, Adrienne would release information to the parents of the normal kids that the Xavier School For Gifted Youngsters was a secret training ground for mutants. During this time, Synch began a relationship with Monet and became one of the few people she would open up to. Later, Adrienne stirred up mutant hatred amongst the human students in the school. When the parents of the non-mutant students heard that their children were going to school with mutants, they all arrived together to take them away from the academy. However, Adrienne Frost had also planted bombs all around the school.
When Banshee and Synch set out to turn off and deactivate all the bombs while Emma and Adrienne fought, Synch found a bomb with too many human students nearby. He tried to "synch" with the nearest mutant, Monet, however, she was too far away, so he only received a portion of her powers. Using all his might, he threw the human kids out of the room, saving them from the explosion. Sadly, he wasn't able to save himself, dying to save his human peers.
Synch was many years later among the many mutants temporarily resurrected by Eli Bard's Transmode Virus to serve as part of Selene's army of undead mutants.
Synch was one of the earliest resurrected mutants by the hand of the Five, due to the fact that it was believed that his powers could enable him to act as a substitute for any of the Five who might need one. Skin was resurrected ahead of his scheduled time to serve as a companion for Synch, as they came from similar backgrounds and time periods.
On Jubilee's birthday, Everett finally reunited with her and Husk, as they went on a LARP escape room with Skin. Monet had also been invited but she said she'd join them afterwards for drinks. When Skin used his powers to overcome one of the puzzles, the staff of the escape room realized they were mutants and released a Sentinel against them, while sending personnel to attack them. After Skin was injured, the odds weren't looking good for their side, but Monet burst through the roof and destroyed the sentinel, saving everyone's lives. The five friends then went to a bar to reminisce about old times.
Later, Synch, Darwin, and Wolverine (Laura) were picked to capture Serafina by entering The Vault, a place where anyone trapped inside could remain there for subjectively thousands of years. Unfortunately, as soon as the three entered the Vault, they lost touch with the X-Men.
During their first day, while engaging the Children of the Vault in battle, Ev discovered that his power now allowed him to synch with non-mutants. With this revelation, he duplicated the Post-Human Fuego's pyrokinesis, and incinerated some of them. After seeing her teammates killed, Aguja angrily killed herself by projecting a force field that destroyed everything around her in an attempt to kill her foes.
However, Synch and his teammates recovered, with Synch copying Wolverine's healing factor. The team then spent 100 years inside the Vault gathering intelligence on the Children. Synch used Wolverine's healing factor to slow his aging and learned that City could resurrect any Children that were killed through cloning in order to continuously evolve them. Synch and Wolverine also became romantically involved. When Wolverine and Darwin were captured, Synch fled the Vault since he could no longer rely on Wolverine's longevity powers to slow his aging. After waiting a week outside, Synch returned to the Vault, where 100 years had past. Synch rescued Wolverine but was unable to save Darwin, who got killed by the City to help develop a new generation of Children. The couple then attempted to leave the Vault, but Wolverine had to stand behind to hold off the Children while Synch fled outside. Synch was eventually killed by the Children, but managed to make telepathic contact with X and ensure everything he'd learned about the Vault was passed onto his resurrected form. Wolverine and Darwin were also resurrected, but neither had the memories of their time in the Vault, leaving Synch with the burden of remembering their time together all alone.
At the Hellfire Gala, Laura and Ev were among the elected to join the new X-Men roster. Cyclops created a new base for this team in a lot of land Emma had purchased for them in Central Park and 86th Street, turning it into a park that was a celebration of mutant accomplishment and a memorial for mutants such as Thunderbird, who couldn’t be revived. In this park, he had Krakoa and Forge create a techno-organic Treehouse for the team to operate in and, unlike the other Krakoan gates and embassies, this area was free to visit by humans and mutants.
After forming, this team fought off two alien attacks: one by the Mind Reaver in Manhattan, the other by the Annihilation Wave in Kansas. They were later attacked at their base by The High Evolutionary, who forced Ev to give a drop of his blood in order to stop him from releasing a deadly virus into the city. In exchange he informed them that the alien attacks were the work of the intergalactic crime lord Cordyceps Jones who had been running bets on who could destroy the Earth first at his casino Gameworld.
