|“|| "You don't have very good taste in guys, do you?"|
"Sweetheart, my last boyfriend was a homicidal lizard, so I think I can handle a Werewolf."
— Cora and Lydia in Currents
The relationship between Cora and Lydia started to develop after the two first met in Season 3's Currents. Although they were initially not on civil terms, due to Cora's hatred of Aiden, Lydia's then-friend-with-benefits, as well as the rest of the Alpha Pack for holding her hostage and killing Vernon Boyd and Erica Reyes. However, Lydia wasn't intimidated by Cora's threats, and after the two joined Stiles Stilinski in trying to get Lydia to use divination techniques in conjunction with her yet-undefined powers to track down the captured Alan Deaton, the two grew closer and became allies and tentative friends. At the end of the first half of the season, Cora and Lydia worked together to get Ethan and Aiden (who had defected from the Alpha Pack and tried to protect Cora's brother Derek Hale from Kali) to the Beacon Hills Animal Clinic to have their lives saved by Alan Deaton. However, their friendship has since been separated due to Cora returning to her old pack in South America.
Throughout Teen Wolf
In Currents, Lydia and Aiden were making out in Coach Finstock's office when suddenly, the fire alarm went off. After Aiden left first, Lydia stayed behind for a moment to get straightened up, but before she could follow him out, Cora appeared, revealing that she had been the one who pulled the fire alarm so as to separate her from Aiden. She remarked that Lydia didn't have very good taste in guys, and when Lydia asked her if she had a problem, Cora informed her that she had been sent by her older brother Derek Hale, Alpha of the Hale Pack, who had "kindly asked" that Lydia stop seeing Aiden.
Before Lydia could reply, Cora added that if she saw Aiden and Lydia together again, she would be pulling her tongue out of her head instead of the fire alarm. Lydia, unimpressed by Cora's threats, remarked that since her last boyfriend, Jackson Whittemore, was a "homicidal lizard," she was confident that she could handle a Werewolf. However, when Cora grabbed Lydia by the wrist and squeezed it tightly, Lydia began to get scared and demanded that she let go. When Cora continued to apply pressure to her arm, Stiles Stilinski appeared behind them and insisted that Cora listen to Lydia and let her go, which Cora reluctantly did.
Off-camera, the three discussed the fact that the Darach had captured Alan Deaton as their third "healer" sacrifice, and, since Deaton had saved them on numerous occasions, they agreed to work together to figure out where he was and save him before he could be killed. Stiles then decided to use Lydia's still-unknown psychic powers and divination to find Deaton's location. They began with a Ouijia board, with Stiles instructing all of them to put their fingertips on the pointer. A moment after Stiles asked, "Where is Deaton?" aloud, both Cora and Stiles opened their eyes and looked at Lydia expectantly. Lydia exasperatedly pointed out that she didn't know the answer before adding that she was under the impression that they were asking some sort of spirit. When Cora asked Lydia if she knew any spirits, Lydia looked over at Stiles and pointed at Cora before snarkily replying "Is she for real?"
With the attempt to use the Ouijia board was a failure, Lydia, Cora and Stiles moved on to Psychometry, a form of divination that involves seeking and gaining information through making tactile contact with personal objects. Stiles held out Deaton's keys to the clinic and asked Lydia to "feel out" for Deaton's location through the keys' energy. Lydia argued that she isn't a psychic, but still took the keys, though clutching them did nothing but alert her to the fact that they were cold.
Lastly, they decided to try automatic writing, where Stiles and Cora intended to have Lydia draw on psychic energy to intuitively write down answers. However, when Lydia immediately began sketching a tree, both Stiles and Cora became overwhelmingly frustrated. When Cora snidely asked Stiles, "Isn't she supposed to be some kind of genius?", Lydia, also losing her patience, pointed out that she was indeed a genius, she just wasn't a psychic. She then pointed out that they were wasting time bothering with Lydia when they should actually be talking to Danny Mahealani, a suggestion that Scott McCall, who had just appeared in the doorway, confirmed by pointing out that Danny was a target the previous night, but he wasn't a sacrifice.
The group decided to split up, with Cora and Lydia going with Stiles to talk to Danny while Scott went to see Allison Argent, who had important information about the human sacrifices. Afterward, Cora, Lydia, and the others met up at the Beacon Hills Animal Clinic to share what each group learned, with the focus being on the revelation that there are numerous telluric currents around and through the city of Beacon Hills based on information in Danny's physics report and the hints Scott received from Deucalion. When Lydia surmised that the locations of where the victims were captured and where the bodies were found were along the telluric currents, Stiles determined that where the victims were killed in-between. As Stiles and Lydia studied the map, Cora's face became horrified as she pushed Stiles' hand over the location of the First National Bank, revealing that Deaton was in the same bank vault where she was held captive for four months.
As the group rushed off to find Deaton, Cora received a text message from Vernon Boyd, which informed her that the plan that he and Isaac Lahey had made to protect Derek from the Alpha Pack failed due to Kali and the twins cutting the power. After a short debate, it was decided that Scott would rescue Deaton on his own while Cora and Lydia drove to Derek's loft with Stiles in an effort to save Derek, Boyd, and Isaac from the Alphas. When they arrived at the loft, they went to the room with the electrical controls, where Cora, Lydia, and Stiles looked around anxiously at the dozens of levers and buttons. When Cora asked what they should do, Stiles instructed them to pull all of the levers, which he, Cora, and Lydia did. Afterward, they rushed up to Derek's loft, where Lydia immediately stopped to a halt in the doorway upon seeing Boyd's lifeless body laying in the shallow water throughout the loft while Derek crouched over him. Cora was confused by Lydia's shock at first until she saw the tragedy for herself and instantly ran past her into the apartment and began sobbing over Boyd's body.
In Lunar Ellipse,
- Both Cora and Lydia are close friends with Stiles Stilinski.
- Cora and Lydia are also similar in that they have inherited their supernatural identities from their respective families, as Cora is one of the last members of the Hale Family, a centuries-old family of Werewolves, whereas Lydia inherited her Banshee powers from her paternal grandmother, Lorraine Martin.