The husband and wife relationship between Hal and Alice Cooper, which is strained due to Hal's attitude towards their eldest daughter Polly's pregnancy by Jason Blossom. Once Hal reveals that Polly and Jason are distant relatives, however, Alice becomes understanding of Hal's opposition.
During their senior year at Riverdale High, Alice learned that she was pregnant with her and Hal's first child. At the homecoming dance she told him about the pregnancy, which lead to a big fight between the two, as Hal wanted Alice to abort the baby while Alice wanted to deliver it. She then went to the Sisters of Quiet Mercy, where she lived for five months until the birth of her their son, who the sister's arranged to be quietly adopted.
Hal stood alongside Alice, as the local authorities brought Penelope and Cliff Blossom to the shores of Sweetwater River to retrieve their daughter Cheryl, just after the mysterious drowning of Jason Blossom. Alice commented to her husband, she hoped Jason had suffered. The following week, he returned to the shore with his wife and daughter, they were forced to stand by as Jason's body was found and brought to land.
The morning after Jason's body was found, Alice and Hal informed Betty that due to the scandal surrounding his death, they'd be having a lot of late nights at the local newspaper they ran together, The Register. Giddy, Alice said that no one cared about an accidental drowning, but the murder of the sociopathic son of the wealthiest family in town was bound to make headlines. Hal reminded her that Jason was barely in his grave but Alice cut him off and dismissively asked him to start the car.
Hal and Alice attended the first annual Taste of Riverdale event, in celebration of the upcoming 75th anniversary of their town. Once there, Hal was forced to assist in breaking up a violent altercation between his wife and Penelope Blossom, who was angry about what the Coopers had been writing in their newspaper.
After their daughter had missed curfew a few times, Hal and Alice knocked on the door of the Andrews house, Hal first apologized to Fred Andrews for coming unannounced, but it had been a rough couple months for them. Before Hal could finish his sentence, Alice cut him off, she insisted that Archie and Betty stop spending time together. Alice claimed their friendship was toxic, on both sides, and their recent behavior reflected that. After seeing that Fred didn't agree with them, Alice pulled her husband back home.
Having learned that Betty and Jughead secretly visited Polly at the Sisters of Quiet Mercy group home where Alice and Hal had hidden Polly to conceal her pregnancy by Jason Blossom, he questioned if Betty had found what she was looking for while she was there. Much to her disappointment, she hadn't. Betty defended her actions as Polly needed to know the truth, she then accused her father of not only breaking into Sheriff Keller's house, and stealing the files on Jason's murder, but possibly being the murderer. Hal had not attended closing night for the Twilight Drive-In, nor was he with Alice the night of the break-in, as well, he hated the Blossom family for allegedly stealing the Cooper family legacy, and Polly being pregnant with Jason's child, which gave Hal motive. Alice laughed hysterically at the notion that Hal could be Jason Blossom's killer. She claimed he didn't have the stomach for it, though she wished he had done it, or that she had done it, as Jason deserved it after what he did to Polly. She then told Betty that she was beginning to sound just as crazy as Polly, and that she may not believe them when they said Polly was crazy, but she would obey them.
Following Polly's escape from the group home, Hal, Alice, Betty, and many other residents of Riverdale orchestrated a search party in an effort to find her. They began in Eversgreen Forest, and headed East since that's the direction Polly would have gone in if she wanted to leave town unnoticed. After a tense run-in with the Blossoms, Alice announced to the town that Polly was pregnant with Jason's child. The next morning, Hal and Alice were asked a number of questions by Betty, such as if Polly and the baby would be staying with them at the house. They assured Betty that Polly would be welcomed back home but lied to Betty and told her that Polly decided to give the child up for adoption. Hal stated that that was the only option available to her. However, Betty already knew that they weren't telling her the truth as she had secretly found Polly the night before and knew she wanted to keep her child. Since she couldn't return home, Betty made arrangements for Polly to stay at The Pembrooke with Veronica and Hermione Lodge.
After attending Polly's baby shower that the Lodge's and Betty had held, Alice confronted Hal over the appointment he had supposedly made for Polly behind Alice's back, so that she could fix her 'mistake', following the discovery her pregnancy. Hal confirmed to the angry Alice that he did make the appointment and that he didn't involve Alice because he knew she would've overreacted. He insisted that she was not ready and that neither was Polly. Alice wondered why sending Polly to the Sisters wasn't enough, to which Hal explained that Polly's life was being ruined by that mistake. When Alice demanded that Polly be allowed to move back into the house, Hal lost his temper and asserted that he would not raise a child with Blossom blood. Enraged that Hal will not accept Polly back into their family, Alice kicked him out of the Cooper household. Initially protesting, Hal turned around and left. 
They reunited when Alice arrived at The Riverdale Register with Betty where they presented him with a USB flash drive that contained a tell-all exposé of the corruption surrounding the Blossom family. Alice and Betty explained to Hal that they wanted to make the Blossoms answer for all the harm they caused, such as taking Polly, who was currently residing Thornhill. However, Hal refused to publish Alice's article as it would only serve her personal vendetta against the family. Having been bitter after getting kicked out of the house, Hal changed the login password for the Registers' computer so that Alice could not use it. He then fired Alice from the paper as retaliation for being kicked out of the house. Alice and Betty left, but before leaving, Alice was so enraged that Hal was foiling her efforts to get Polly back that she threw at rock at the shop's front door, shattering the glass, much to Hal's (and Betty's) shock.