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Some people call me a terrorist. I consider myself a teacher. America, ready for another lesson? In 1864, in Sand Creek, Colorado, the US military waited until the friendly Cheyenne braves had all gone hunting, waited to attack and slaughter the families left behind and claim their land. Thirty-nine hours ago, the Ali Al Salem Air Base in Kuwait was attacked. I... I... I did that. A quaint military church filled with wives and children, of course. The soldiers were out on maneuvers. The braves were away. President Ellis, you continue to resist my attempts to educate you, sir. And now, you've missed me again. You know who I am, you don't know where I am, and you'll never see me coming.
~ Trevor Slattery issuing a threat to President Ellis on live television.
He is a drug-addicted actor who was hired by Aldrich Killian to inpersonate the infamous Mandarin of the Ten Rings in order to cover Killian's true plot. However, due to his ruse, Slattery is later captured by Jackson Norriss under the real Mandarin's orders.
Being a washed-up actor, Trevor Slattery was hired by Aldrich Killian of A.I.M. to pose as the Mandarin as part of Killian's true plan to cover his failed Extremis experiments. To that end, Slattery (posing himself as the Mandarin) publicly announces his responsibility behind a Extremis attack every time one of Killian's experiments failed and caused a great number of casualties. When Tony Stark's friend Happy Hogan was caught in an Extremis attack that left him injured while Slattery took responsibility for the attack, an angered Stark vows to track down Slattery and make him pay for his crimes.
However, unknown to Stark, Killian took the opportunity to kidnap U.S. President Matthew Ellis (thanks to Vice President Rodriguez, who is in league with Killian), just as Stark arrived to confront Slattery in his mansion. However, Stark soon learn that Killian is the true mastermind behind the attacks and that he paid Slattery to pose as the Mandarin to cover his involvement the entire time in exchange for the fame and lavish lifestyle that Slattery desired.
Following the death of Killian and his Extremis soldiers, a drunken Slattery is last seen being arrested for his involvement with Killian. Despite his arrest, Slattery is astounded to see the press awaiting his arrival, feeling very satisfied that he finally got the fame he craved for all his life.
All Hail the King
Slattery was sent to Seagate Prison for his crimes, but he finds it to be quite comfortable living there as he is idolized by many inmates for his actions, even getting an inmate named Herman to serve as his bodyguard and butler. A news reporter named Jackson Norriss comes by for a documentary on Slattery's life. To that end, Slattery explained to Norriss of how he lost his mother during the 1960s and his role as a main character in a rejected TV pilot that aired on CBS.
While relating the history of the Mandarin to Slattery and Herman, Norriss retrieved a handgun he had concealed inside his camera and used it to kill the guards, much to both Slattery and Herman's shock. Norriss then revealed himself to be a Ten Rings operative, as he was assigned by the real Mandarin to take in Slattery for impersonating him. Herman tried to save Slattery by attacking Norriss, but the latter kills Herman by stabbing him in the neck, much to Slattery's shock.
An angry Slattery picked one of the dead guards' guns, intending to kill Norriss to avenge Herman's death. Unfortunately, Norriss disarms Slattery and delivers him to the real Mandarin as ordered. It's unknown what happened to Slattery afterwards, though it might be implied that he would be executed by the Mandarin for his offensive actions or become one of his servants for as yet unknown purposes.
My name is Trevor, Trevor Slattery. What are you? Are you a decoy? You're a double, right? What? Like an understudy? No, absolutely not.
~ Trevor Slattery talking to Tony Stark
There's just one lesson left, President Ellis. So run away, hide, kiss your children goodbye. Because nothing, not your army, not your red, white and blue attack dog can save you! I'll see you soon.