While posing as the man known as Barrington, Black Tom Cassidy freed a mutant named Mondo from the Hellfire Club and their applicant, Cordelia Frost. Seeing an opportunity to infiltrate his cousin Banshee's school at the Massachusetts Academy, Black Tom created a duplicate of Mondo using his growing plant-life control powers. When Cordelia went to Emma Frost, her sister and headmistress of the Massachusetts Academy, for help, "Mondo" was rescued by Generation X and subsequently accepted an invitation to join the school.^[2]

However, Generation X later learned that the Mondo they had rescued wasn't the real Mondo but a clone. As Banshee and Emma Frost did battle with Black Tom, the Mondo clone began hunting down the members of Generation X. As the Mondo clone was about to attack Jubilee, however, it was shot dead by the anti-mutant militant Bastion, chief operative of Operation: Zero Tolerance.^[3]