Scott Lang's daughter Cassie Lang was suffering from a heart disease, but the only doctor was captured by a super-villian, so he stole the ant-man suit from Dr. Hank Pym to bust the doctor out. He busted the doctor out and Hank Pym let him keep the suit, and Cassie later became a superhero named stature. Scott died because the Scarlet Witch killed him, but he came back to life. He joined the Avengers, Heroes for Hire, and the FF. Like the original Ant-man he can control ants and manipulate his size.