 Roxxon operated on Screaming Mimi's vocal cords, giving her the ability to drive a person to insanity with her screams.The only Grappler who is not capable of superhuman strength, Screaming Mimi proved useful on several missions.Soon after Titania and Letha were killed, Screaming Mimi joined the Masters of Evil, and eventually turned over a new leaf, calling herself Songbird and joining the Thunderbolts.