Emily Eve Dinsmore was a childhood friend of Lana Lang. She was a recurring antagonist in Seasons 2 and 3 of Smallville.
Her child form was portrayed by Jodelle Ferland who played Alessa Gillespie and Dark Alessa in Silent Hill, Aggie Prenderghast in ParaNorman, Lillith Sullivan in Case 39, Michael Rollins in The Messengers and Audrey in Revenge Porn. Her young adult form was portrayed by Amber Rothwell.
Emily was best friends with Lana Lang when they were children. They spent all their time together playing. One day Emily and Lana went to the river by themselves during a thunderstorm.
Lana got too close to the edge of the bridge and slipped falling into the river. Emily heroically jumped in after her and got her to safety but tragically Emily drowned before she could swim to shore.
After Emily's death, her parents moved away from Smallville to Granville. The accident took a toll on Mr. Dinsmore's relationship with his wife and they got divorced. Mr. Dinsmore began experimenting with cloning 6 years after Emily's death. He was able to use meteor rocks to accelerate the growth of cloned rabbits. When he applied this technology to his daughter, he had mixed results.
He was able to clone Emily successfully and she was beautiful, sweet, and smart, but her accelerated growth but the accelerated growth caused severe genetic defects; specifically, she had no moral center and no conscience. That defect, combined with her abilities of super strength and super speed, made her very dangerous.
The Emily clone ran away from Granville to Smallville to find her friend Lana Lang at the Talon. Lana was cleaning up the theater when out of nowhere Emily appeared and stood in the aisle, still ten years old. Because Emily was still ten years old, Lana thought she saw a ghost and the poor girl was very confused by her friend's fear. Scared, Lana turns to run out and finds Emily suddenly in front of her.
Clark arrived and asks Lana what happened, but Emily has disappeared. Lana was sitting in her bedroom, looking at photos of herself and Emily when they were ten years old. Emily appeared again and frightens Lana, who thinks Emily isn't real. She tells Emily that she died six years ago. When Clark enters, Emily is gone, and Lana was convinced she's seen her ghost.
Emily returned to her childhood home in Smallville where she saw her father Mr. Dinsmore. She was upset that the bunnies were gone and asks her daddy to explain why Lana said that she died. Her father, however, was apprehensive and didn't explain it to her. He urgently tells her to get in the car, but Emily refused, as she's tired of being locked up. When he tries to instruct her again, she super speeds away and stabs him with a rusted metal pinwheel.
Clark and Pete go to the cemetery to make sure that Emily's body is still buried in her coffin, they see Emily in the cemetery too. When she tries to run away, Clark uses his super speed to keep up with her and realizes that is how she is able to appear from out of nowhere. She gets away, but she leaves her necklace behind.
At the Talon, Lana is locking up when Emily arrives and scares her again. By the time Clark enters, again Emily is gone. Clark shows Lana the necklace, reassuring her that she's not crazy.
At the Smallville Medical Center, Lex Luthor visits Mr. Dinsmore and finds Emily there with him, seated near the door. She tells Lex that Lionel took the bunnies away. Lex turns around for a few seconds, and turns back and finds Emily gone. Clark went to Mr. Dinsmore's house only to find the lab gone from the basement and saw Emily there, reading her diary. She asks why the other sleeping girls looked like her. Clark tries to explain, but Emily super speeds away when Lex arrives.
Lana finds Emily with her at the Kent Farm, and wants to go to the river. Lana doesn't want to go, but when Emily runs away, Lana can't help but follow her. Clark arrives home, but he can't find Lana. Instead, he finds the picture Emily drew of the two of them at the river. At the river, Lana tells Emily how she died.