He was one of the mutants that survived Mr. Clean’s massacre of the mutants living in the London sewers.
Creation
Double Helix was created by Joe Casey and Ian Churchill in 2001 and first appeared in Uncanny X-Men 395.
History
Double Helix was one of the London based Morlocks, a community of mutants who lived in the sewers. The community was being hunted down by Mr. Clean, an agent of the Church of Humanity, who was genetically engineered to murder mutants.
Powers
Double Helix was a double-headed mutant