Stranger Things: The First Shadow

In the prologue set in 1943, the USS Eldridge undergoes a secret U.S. military experiment to render it invisible using a force field, inadvertently transporting it to Dimension X, where most of the crew is slaughtered by grotesque humanoid creatures. The narrative then shifts to 1959 in Hawkins, Indiana, where the troubled Creel family—father Victor, mother Virginia, teenage son Henry, and younger daughter Alice—relocates from Nevada seeking a fresh start. Henry, a pale and moody outcast plagued by vivid hallucinations and emerging psychokinetic powers, enrolls at Hawkins High School, where he struggles to connect with peers amid whispers of his family's dark past. Isolated and tormented, Henry catches the eye of Patty Newby, the overlooked adoptive daughter of the strict school principal, Mr. Newby; she senses his uniqueness and encourages him to channel his abilities positively, leading to tender moments where he conjures illusory visions of her performing triumphantly on stage, fostering a budding romance sealed with a kiss.

Parallel to Henry's isolation, vibrant high schooler Joyce Maldonado rallies her peers for a production of the Appalachian folk horror play Dark of the Moon, navigating crushes, rivalries, and her own dreams of escaping small-town life alongside her boyfriend, the abrasive Lonnie Byers. Meanwhile, eerie animal mutilations grip Hawkins—pets like Claudia Yount's cat Prancer vanish or turn up gruesomely slain—prompting amateur sleuthing from Bob Newby, Patty's nerdy adoptive brother and host of a faltering radio show, who enlists his friends Joyce and rebellious James "Hopper Jr." Hopper, son of the local police chief, to track the culprit using Bob's homemade radio-tracking gadget. As the trio uncovers patterns linked to power surges and shadowy figures, Henry, increasingly haunted by a malevolent entity in the Void—a psychic realm of his visions—succumbs to its whispers, slaughtering neighborhood animals in trance-like states. Patty, desperate to understand her love interest, implores Henry to use his powers to locate her long-lost biological mother, a lounge singer, but the expedition spirals into terror when the entity seizes control, nearly killing Mr. Newby in a psychokinetic assault witnessed by Patty, who professes her love to pull Henry back from the brink, leaving her father blinded and comatose.

Desperate to contain the fallout, Virginia Creel, secretly medicated by enigmatic scientist Dr. Martin Brenner to suppress her son's "gifts," commits Henry to Brenner's care at the newly established Hawkins National Laboratory. There, Brenner—driven by his own lineage as the son of the Eldridge's sole survivor, who confessed the horrors of Dimension X on his deathbed—interrogates Henry about his powers, revealing a chilling backstory: as a child in Nevada, Henry accidentally activated stolen experimental tech in a cave, teleporting himself and a defecting scientist to Dimension X, where exposure to the shadowy entity altered him forever, granting his abilities but cursing him with its influence. Forced into a sensory deprivation tank, Henry manifests visions of Demogorgon-like creatures for Brenner, who then compels him to telekinetically execute a prisoner as a test; overwhelmed, Henry instead slays two guards and begs for release, citing his devotion to Patty, whom Brenner threatens to eliminate as a vulnerability. Returning home unhinged, Henry probes his family's unspoken resentments through mind-reading, sensing Virginia's plot to institutionalize him permanently; yielding to the entity's possession, he savagely murders his mother and sister, rendering Victor catatonic in the aftermath.

The climax erupts at Hawkins High during the Dark of the Moon premiere, where Henry infiltrates the theater to shield Patty from Brenner's pursuit, their reunion atop the rafters interrupted by the doctor's arrival. As the entity overwhelms him once more, Henry hurls Patty from the heights in a fit of uncontrolled rage, hospitalizing her while Brenner reclaims him for further experimentation; Victor is wrongly implicated in the Creel murders, his survival overlooked amid the chaos. Bob, Joyce, and Hopper Jr. misattribute the animal killings to Victor, closing their probe prematurely. In a poignant 1963 epilogue, a drafted Hopper Jr. departs for Vietnam as Joyce bids him farewell, their unspoken affection lingering. Years later, a shackled adult Henry, now "001," spies through the Void on a limping Patty reuniting with her mother in Las Vegas; Brenner, celebrating breakthroughs in blood transfusions for test subjects, liberates him briefly in the Rainbow Room, where he encounters a young girl and murmurs, "Hello, Eleven," as thunder cracks and Vecna's form emerges in silhouette.