Tommy Miller

Tommy Miller is a secondary antagonist from the film Th Butterfly Effect, he is the younger brother of Kayleigh Miller, Evan Treborn's girlfriend.

We first meet him in a flashback as a young child sitting in the dark corner of his basement with an eerie emotionless expression on his face while twisting the head off a doll, he tells his father that he wants to be in his home movie with his sister but his father tells him that he wants Evan to be in it, his father turns out to be a pedophile who takes videos of his children naked while he films them.

We cut to a couple years later when he is 12 as he Kayleigh, Evan, and their friend Lenny sneak into a movie theater playing the movie Se7en, after the movie when Tommy sees Evan and Kayleigh kiss he is furious as it is implied that he harbors incestuous feelings towards his sister and hates Evan, he then takes out his anger on a teenager brutally assaulting him with a pole, as he is ushered out he is shown smiling with sadistic glee.

Later he steal's Evan's dog ties it in a sack and pours gasoline on it intending to burn it alive, as Evan, Kayleigh, and Lenny try to interfere he viciously attacks them with a piece of plywood and knocks them unconscious, he then proceeds to burn the dog to death, we later find out he was institutionalized and later escaped from the institution as an adult, he then confronts Evan while he and Kayleigh are at college and attacks him with a baseball bat, Evan manages to take the bat from him and eventually beats him to death in self defense, Evan is then arrested for it.

Evan travels back in time as it happens whenever he blacks out to try and get Tommy to be a better person, in one timeline he is successful but he is without limbs as Lenny had been forced by Tommy to plant dynamite in a mailbox which had caused the death of a woman and her baby, and Evan took the dynamite but it exploded and his limbs had to be amputated, and in this timeline Tommy is a devout Christian and devotes his time to helping the less fortunate.

In another timeline we find out the reason why Tommy is such a psychopath, his father in addition to molesting him and his sister he also beat him on a regular basis, and in this timeline he goes back to the moment where he tries to burn his dog to death but this time he convinces him not to do it, but Lenny stabs Tommy to death with a shard of metal because he was traumatized by Tommy telling him that he would kill his mother if he didn't plant the dynamite in the mailbox.

In the end Evan goes back to the day he first met Kayleigh and doesn't befriend her so that she and Tommy won't end up with their father who is the cause of their problems.

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