History
Captain Britain was a member of the Illuminati, acting in order to counter the Incursions.
Heading to the mutant city-nation of Tian, the new location of an incoming incursion, they encountered the Sidera Maris, automatons of the Mapmakers.
The Mapmakers, aware of the danger represented by the mutants' presence (cataloging their reality as an Omega-Level threat), targeted their X-Genes to terminate them, including Betsy.
The incursing Earth was destroyed and although they were allowed to leave, the rest of her fellow Illuminati attacked, but were all killed except for Iron Man, who was stuck in his armor.[1]Attributes
Powers
, including Flight.