Chloe Sullivan is one of the main characters of the WB/CW series Smallville. She is a close friend of Clark Kent, but served as the main antagonist in the Season 3 episode "Truth".
Chloe was born in 1986 in Metropolis before moving to Smallville with her father in the year 2000. Between this time, Chloe's mother left the family when she was five due to having a meteor power that caused her daughter harm. From an early age, Chloe was interested in journalism and mysteries.
After attending Smallville High School, Chloe quickly befriended Clark Kent after he showed her around the town and his family farm. She also became friends with Pete Ross. Chloe was a reporter for the school newspaper the Torch and had a Wall of Weird where she researched about the strange occurrence due to the meteor shower.
Chloe met an old employee who worked with her father at LuthorCorp and asked him if someone was sabotaging his chances for getting a new job. The man stated that new projects were in development and it was best if her father stayed away. She then stole his ID badge and uses it to get into a secure laboratory at the plant.
While inside, Chloe accidentally hits a button, which sets off an alarm. Suddenly, she is blasted by a green mist that causes her to briefly pass out, but she awakens and escapes before security can catch her. Unknown to her, she had been exposed to a kryptonite-based truth agent that momentarily obtained the ability to make anyone tell her the truth.
First she used her new abilities on the literature teacher Mrs. Taylor when she inadvertently forced her to reveal her past connections with a radical group. She continues to say that she changed her name after playing a minor part in a radical group that blew up a bank in 1972. She is guilt-ridden and upset and her son is horrified. Before she could ask any more questions, William was upset and told Chloe to stay away from them.
Chloe smiled deviously after hearing Marianne Taylor's confession. She couldn't believe her scoop and puts the story on the cover of the Torch. The whole school was mad at Chloe for the story and Clark is annoyed at her lack of discretion, saying the police should handle the matter. He asked her about breaking into LuthorCorp and tells her that it's wrong to allow people to tell her their private thoughts.
Chloe was amazed and asked Clark what his secret is, but she notices that he doesn't answer. An upset Clark then states he couldn't believe she asked him that. Chloe tore through Smallville making Lex Luthor, Martha Kent, Lana, as well as others tell her their private thoughts and in the process, set off an avalanche of unfortunate events.
Chloe is approached by Will at the Talon who is angry for ruining his and his mother's life. Everyone leaves when they see Chloe and Lana admits that no one likes being around Chloe anymore. She tells Chloe that she has applied to school in Paris because she doesn't fit in. She didn't feel like part of Chloe's family, and she didn't trust Chloe. Chloe asks why she hasn't talked to her about this before and Lana says she can't trust her. Chloe was noticeably upset by this revelation and left.
Chloe then went to the Luthor Mansion, summoned there by Lex. He knows that she can make anyone tell her the truth and says he wants her to use her ability to find out what Lionel made him forget while he was in Belle Reve.