Private Sarah "Rosie" Rosenthal was part of Sergeant Lopé's security team aboard the colonization spacecraft USCSS Covenant. She was serving on the ship during its disastrous voyage to Origae-6, during which it suffered several catastrophes that resulted in the loss of most of the ship's crew and its hijacking by David.
When Rosenthal and the rest of her team arrived back at the dropship with an increasingly sick Hallett, they were greeted with the destruction of it following a misguided effort to kill a Neomorph on board.
Moments later, Hallett started convulsing and screaming in agony, and seconds later a Neomorph ripped it way through his throat and mouth, killing him while the rest of the team watched in horror. The two Neomorphs then escaped into the night.
While Hallett's husband, Lopé, mourned over Hallet's body, Rosenthal consoled him, but told him that there was nothing he could do and that Hallett was gone.
Shortly afterward, the two Neomorphs returned to attack the crew. Rosenthal, Cole, and Ankor tried to kill the first Neomorph by shooting it. Enraged, it spun around and struck Ankor with its tail, slitting his throat, tearing his cheek open and ripping his jaw off, killing him. The Neomorph then turned its attention to Daniels, and it ran at her and took her to the ground.
It was Rosenthal who saved Daniels by shooting the creature dead. After a few seconds, the second Neomorph returned. As the team tried to locate it in the long grass, Rosenthal turned around - only to see the Neomorph running toward her. Rosenthal immediately raised her rifle to shoot it, but the Neomorph disarmed her and took her to the ground before she could fire a single shot. The Neomorph nearly mauled her to death, but she was saved when a synthetic named David scared it away by firing a flare gun into the air.
Rosenthal and the remaining members of the team were escorted to a safe haven by David. While in David's temple, she informed Captain Oram that she was going to freshen up for a while, to which he told her not to go far. While washing up and patching the wounds she sustained during the earlier Neomorph attack, Rosenthal turned around - only to be faced with the same Neomorph from earlier, now fully-grown and towering over her.
Rosenthal nervously reached for her pistol, but before she could grab it, the Neomorph attacked her, biting into her neck with its jaws while simultaneously tearing her apart with its claws. Rosenthal's screams were soon cut short when the Neomorph killed her via decapitation.
Her mutilated corpse including her severed head were later found by Oram and David, with the Neomorph still eating her remains. Against David's pleas, an enraged Oram shot the creature dead.
- Rosenthal may be Jewish, as she wears a Star of David necklace. The surname Rosenthal is also arguably of Jewish origin.