He is portrayed by Guy Pearce
After curing himself of his disability by using a dose of his own Extremis virus, he orchestrated many terrorist attacks as part of his experiments, while creating a false Mandarin person through the use of an actor, to mask his illegal activities. He orchestrates the attack at Tony's home, kidnapping Pepper Potts afterwards. Having Pepper Potts as his "trophy" and hostage, he injected her with the Extremis virus to further motivate and antagonize Tony.
After his men had abducted President Ellis, Killian had planned to orchestrate a live feed showing the murder of Ellis, only for Tony Stark and James Rhodes to interrupt and attack their base with the help of Tony's J.A.R.V.I.S.-controlled Iron Man suits. In the ensuing battle, Tony finally finds Pepper, only for her to be trapped under debris. Before he is able to rescue her, an angry Killian attacks Tony with Tony distracting Killian to rescue Pepper.
While Pepper seemingly dies after falling to her apparent death, Killian approaches Tony for a one-on-one battle. The two engage in a brutal and epic final fight with Tony switching between various Iron Man suits as Killian destroys each one after another. As Tony was unable to attach any more extra armor onto himself, JARVIS sent the Mark 42 prototype to aid Tony in his battle. Tony then kinetically attached the armor onto Killian to stall his movements. Tony then activated the Mark 42's self-destruct function attempting to destroy Killian in the process.
After the complex in which the two were fighting was demolished, the battered Tony is confronted by Killian who is shown as surviving the explosion due to the Extremis virus that he created and took. Approaching Tony, he elaborates upon the revelation that he is the real Mandarin and that the two should stop "wearing masks" to hide their identities. Just before he is able to attack Tony, Pepper attacks him from behind, having survived her fall with the help of her new found Extremis abilities. Just before Killian is able to retaliate, Pepper rips an arm from one of the stray Iron Man suits, attaching it to her herself and utilizing its capabilities to finally kill Killian for good.
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