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In the Season 3 episode "Obsession," Alicia is among the group of Smallville High School students on a field trip to LuthorCorp. She gets trapped in a malfunctioning elevator with Clark Kent, who's forced to use his powers in front of her to stop the elevator. To prevent Clark's secret from being exposed, she reveals her own power of teleportation and teleports herself and Clark out of the elevator. She promises to keep Clark's secret.
Clark and Alicia start to bond, and they slowly form a romance. Over time, Alicia became infatuated with Clark to the point of obsession, even teleporting into his bedroom in order to sleep with him. Clark was severely reprimanded by his parents and Alicia apparently teleported away. However, she was actually spying on their conversation and learned of Clark's vulnerability to kryptonite.
However, Alicia becomes possessive of Clark to the point where she attacks her own father after he warns Clark about his daughter. Clark asks her if she harmed her father and they argue until she teleports away. Pretending to be wanted by the police, Alicia found Clark at an old warehouse and he once again tries to convince her to turn herself in.
She says they should just run away and Clark pretends to agree. He tries to trap her in a lead-painted room, but she figures out his plan and uses a meteor rock to subdue him. She leaves him incapacitated on the floor and walks out.
Alicia arrives at the Talon She and attempts to kill Lana Lang with a knife, saying that Clark told her all the secrets he would never tell Lana. Clark arrives to stop her by dousing her in lead paint and she is unable to teleport away.
Alicia was taken to Belle Reve where she was treated by Dr. William McBride and appears in the Season 4 episode "Unsafe." She is released from Belle Reve with a clean bill of mental health, and returns to Smallville, where she rekindles her relationship with Clark, who's initially wary of her.
She wanted to prove that she was better. When her therapist, Dr. William McBride, stalks her and insists that she not see Clark, Alicia tries to persuade Clark to leave Smallville with her.
When Clark refuses, she gives him a Red Kryptonite necklace, causing his uninhibited personality, Kal, to emerge.
Alicia and Kal are getting into a very heated moment when she asks him to slow down, because she's a virgin. Kal is not very interested in her trepidation, proclaiming, "That's great! So am I!" Eventually, he blurts that he wants Alicia to marry him and breaks her lead bracelet off.
Kal and Alicia teleport to Las Vegas to get married so they can consummate their relationship, but during the honeymoon, Alicia decides she wants "all of Clark" and removes the necklace, restoring Clark to normal. Clark, however, is disgusted with Alicia's actions and leaves.
Later, when Clark is confronted by Dr. McBride at gunpoint in his barn, Alicia appears and teleports in front of Clark, taking a bullet fired by Dr. McBride at Clark, protecting Clark's secret and redeeming herself in Clark's eyes. Sometime after that, Clark visits Alicia in the hospital and returns her lead bracelet (which prevented her from using her powers). In the final scene, Alicia comes by the Kent barn, where she and Clark reconcile, and she breaks down in tears as Clark hugs her comfortingly.
In the next episode, "Pariah," Alicia and Clark attend karaoke night at the Talon but receive a chilling reception. Alicia asked Lana to give her another chance, but Lana walked away. She later becomes the prime suspect after Lana and her boyfriend Jason Teague were attacked in a locked room.
In his loft, Clark receives a visit from Alicia. He asks her if she was in the alley and she again tells him that she had nothing to do with Lana's attack. However, she admits that she was not wearing her bracelet, because giving up her powers was like being in prison.
When Clark begins questioning her innocence, she tricks Clark into revealing his powers in front of Chloe Sullivan. Tragically, Alicia is murdered by Tim Westcott, a metahuman who turns out to be the one who attacked Lana and Jason earlier in an attempt to frame Alicia.
Alicia is buried in Smallville's cemetery.
Alicia was mentioned when Lana asked Clark if they ever spend the night together and Clark assured her he didn't. Before Clark's five year reunion at Smallville High, the guidance counselor had files on deceased students that contained Alicia's, Tina Greer and Jake Pollen.
According to the High School Yearbook, Alicia was most likely to "Travel the world".