Mister X
The Thunderbolts are sent after Mister X by Norman Osborn. The Black Widow briefs them about Mister X, who informs them that he will be attending Madripoor's opera house with Tyger Tiger, and that the Black Widow and Paladin will pretend to be ballet dancers. Stun guns are teleported into the disguised Thunderbolts, and Mister X moves in to intercept them. As the witnesses flee, the Thunderbolts reveal that their assassination attempt was a sham, and that Mister X had arranged to meet them there. A body double is teleported in, and incinerated to cover Mister X's disappearance, and he is welcomed as the newest member of the Thunderbolts. He reveals that he doesn't need Osborn's money, and is looking for a challenge, but the downtime between missions becomes frustrating for him, prompting him to hijack a teleporter and jump into a South American warzone to kill the guerilla fighters in the area. With great pleasure, Mr. X later participated in the "Siege" crossover, fighting and even killing Asgardians. After Osborn was proven defeated, Mr. X briefly possessed the Spear of Odin, but was savagely beaten and disarmed by Quicksilver, who openly mocked Mister X's inability to hurt him despite Quicksilver's limited hand-to-hand combat experience. Mr. X disappeared before being arrested.