David left in 1993. The series continued under writer J. M. DeMatteis and artist Jan Duursema, but struggled to distinguish itself among other X-books. Shortly after David's tenure on the book ended, Forge, a former government weapons contractor whose mutant powers were his brilliant engineering skills, was added to the group; first replacing Cooper as their liaison after she had been compromised by one of Magneto's Acolytes, and later as an active member. Cooper later becomes an active member as well, her marksmanship and athletic skills compensating for her lack of superhuman powers.