William Brown, an aspiring musician and sound engineer, resides in a rundown apartment with his girlfriend, Emily](/actor/kiran-deol). For three long years, he's been fixated on creating a prog-rock album in his spare time, yet he's faced an uphill battle in finding an audience for his unique sound. One fateful evening, after a long day at the recording studio, William discovers he has a new neighbor: a mentally unstable Eastern European man named Vlad, who quickly becomes a source of torment for him. Vlad's incessant yelling, wall-pounding, and unwelcome late-night EDM parties make life unbearable for William.
Fed up with the ruckus, he resolves to confront Vlad at his apartment. However, what begins as a simple request for reduced volume escalates into ludicrous chaos when Vlad, instead of complying, mocks William and challenges him to a fight. In an unforeseen accident, Vlad decapitates himself with a mishandled gym equipment, leaving a shocked William grappling with the unexpected turn of events. In a state of confusion, William decides to dismember Vlad's body and stash it in his bathtub. To his astonishment, Vlad soon reanimates, exclaiming that he now "lives in his head rent-free," throwing William's world into further disarray.
As fate would have it, William's attempts to dispose of Vlad's remains at a smelting plant take a darkly comedic twist when a mishap occurs, leading to Vlad's doings causing chaos outside his workplace. In a tragic turn, William accidentally drives over a local vagrant, Auggie, who happens to be an idolized musician known as "Swig" Anderson. Just like Vlad, Auggie inexplicably rises from the dead shortly after his demise, adding to William's mounting frustrations.
Determined to find a solution, William dumps the bodies of Vlad and Auggie on the roadside deep in the woods. Back at home, he is met with another surreal turn of events when Eleanor, the well-meaning apartment manager, accidentally electrocutes herself while attempting to fix a faulty fuse box. Haunted by guilt, William recalls how Eleanor had solicited his help for the repairs and how he had brushed her off, too preoccupied with Vlad's decomposing remains.
As William grapples with these bizarre experiences, tension grows between him and Emily, who becomes increasingly frustrated with his obsessive focus on his music instead of their relationship. When Emily leaves in anger, William finds solace in a boozy party at Vlad's apartment, during which he rekindles a budding friendship with both Vlad and Auggie.
Riding high on the wave of companionship, William invites Vlad and Auggie to hear one of his songs. Their enthusiastic reception brings him immense joy, until things take another wild turn when Phillip, a fellow tenant, rudely interrupts, demanding silence. In a heated confrontation, William kills Phillip in self-defense, plunging him further into a morass of chaos and guilt.
Later, William is called to the morgue to identify Eleanor’s body. To his shock, she also revives, and he bitterly apologizes, fearing he was the cause of her demise. Eleanor reassures him that he bears no blame, and the two of them decide to collaborate on completing William's long-suffering album with the unexpected aid of their unconventional zombie friends.
With newfound spirits, William and his undead companions venture to the recording studio, where, despite the absurdity of their situation, they work together to put finishing touches on his album. Through laughter, tears, and an uncanny collection of experiences, they ultimately find redemption and connection in the unlikeliest of friendships.
