- "You know, in every epic tale, there's always one person who believes in the hero first. Someone who helps inspire them to greatness. And maybe it wasn't just a fluke with you. I've been thinking that's my true calling; finding heroes and helping them realize their true potential beyond the reach of Watchtower." - Chloe Sullivan to Clark Kent, Fortune.
After witnessing Oliver's abduction through a video feed, Chloe exhausted her resources to try to find him, eventually resorting to using the Helmet of Nabu, which rendered her unconscious. Once she recovered, she relayed part of what she had seen to Clark and sent him to Cadmus Labs to extinguish a fire and stop Lex's clone. Chloe said goodbye to Clark and later traded herself for Oliver in order to save him.
When Chloe left, all the records of her existence disappeared, making it appear that she had never been born. Tess revealed to Oliver that Chloe had asked for her help resetting the Watchtower computers so no one could find her. Later, Oliver learned that rather than suffer further torture, Chloe killed herself with a cyanide pill to protect Oliver from Rick Flag. However, Clark and Oliver came to the conclusion that she had faked her own death after finding a cyanide antidote in her apartment. Clark determined that after seeing the future, Chloe had planned her departure for unknown reasons.
Despite falling off the grid, she still contacted the new editors of the Smallville Torch newspaper the night after the high school reunion, pleased that they had been continuing her work with the Wall of Weird, which they formatted digitally. Her message thanked them for "carrying" her Torch. Also, it was revealed that she had become a legend in the Smallville High due to her stories about the bizarre and rare things that she investigated.
Later, when Clark proposed to Lois and she accepted, Chloe sent Lois a letter with a gift for her wedding day, congratulating her on her engagement to Clark. A flashback revealed that before her disappearance, Chloe talked with Lois about why Clark and Lana's relationship never worked out. When Lois questioned Chloe about her relationship with Oliver, Chloe instantly understood that Lois had discovered Clark's secret and then encouraged her cousin by saying that Lana was never destined to be with Clark. Apparently, Chloe had seen Lois' future, as she was the first to congratulate Lois on her engagement almost immediately after it happened.
After months of being missing, Chloe reappeared and used the resources of the Suicide Squad to save her friends after they were abducted by the VRA. Although Clark failed to trust her after she disappeared without apparent explanation, he eventually came to trust her again thanks to Lois' influence and finally Chloe talked with Clark and later Oliver about her reasons for leaving, revealing that after putting on the Helmet of Nabu, she saw that her friends would be kidnapped and decided to leave in order to save them at the right moment. Then Lois and Clark asked her to be Lois' Maid of Honor and later confirmed to Oliver that she had decided to stay in Metropolis again.
Chloe and Oliver resumed their relationship and waking up together one morning, saw on television an assassination attempt on Martha Kent. Chloe went to check Martha at the hospital and there, Martha asked Chloe why she leaves Clark's side. They both agreed that leaving Clark had been for the best, but that they should now stay with him for support due the VRA. After helping Lois in her campaign to overthrow the VRA, Chloe went to the Kent Farm to watch the VRA announcement and shared in the celebration when the act was repealed.
With the VRA rejected, Chloe and Oliver decided to go out on an anniversary date at the Ace of Clubs but had troubles because of their identities. While using another couple's surname to get an already reserved table, Chloe and Oliver became embroiled in a mystery involving the darkness that ended in Chloe being kidnapped by Desaad. She was confronted with hallucinations of the Deadly Sins and unfulfilled dreams, but bravely resisted. After being rescued by Clark, Chloe revealed to Oliver that she regretted erasing her identity and felt lost, especially when she looked back on the person she was in high school.
After getting magically drunk at the engagement party of Clark and Lois, Chloe found the part of a marriage certificate with her name on it and mistakenly thought that she had married Clark. After solve the mystery, she met Clark in the barn and informed him that she was once again leaving Smallville because she had discovered what she wanted done with her life: return to journalism and find more heroes and inspire them to reach their full potential.She said she was moving to Star City and after one last reunion with the group in the Watchtower, Chloe snuck away to leave but was stopped by Oliver, who revealed that it was in fact him that she married the night before. Chloe then left to start her new life, with her husband, Oliver, by her side.
Chloe returned to Smallville to be present at the wedding of Clark and Lois and was concerned about the recent actions of Lois, who showed no interest in marrying. Following the advice of Oliver, Chloe went to the Daily Planet to talk to her cousin to encourage her to continue with the wedding, and after an emotional conversation in which Lois was firm in her position. Chloe, really upset by her cousin behavior, gave Clark's vows to Lois for her to read. After Lois read the vows, Chloe was joyous that words and actions worked as she Lois' positions over the matter changed.
The wedding took place, and Chloe was with joy as her cousin and her best friend walked together down the aisle. During the ceremony, the ring that Oliver had shown her earlier drew Chloe's attention because something about it was different. She began to sense that something was not right. Chloe noticed that the ring grew brighter as it approached Clark's finger, which she then realized it was made of gold kryptonite. In a panic, Chloe intercepted the ring before Lois could place it upon Clark and saw in horror as Oliver revealed he was possessed by the darkness. With the help of Lois, Chloe drove everyone outside the chapel as a battle between Clark and a possessed Oliver began.
After Clark managed to save Oliver, Chloe met with him at the Kent Farm to began investigating the coming Apokolips. With the Watchtower systems out of service, Chloe told her friends she needed to return to Star City to use the equipment and database at her house to investigate more and call the other team members. She gave Clark a hug and left him with a puzzling line.Oliver offered to take her to the city, she refused the idea saying he needed to stay in Metropolis, stating she could handle it on her own because she was a hero too. Chloe then left heroically towards Star City to further investigate what was happening.