Bite

Casey Morgan travels to Costa Rica with her friends Kirsten and Jill to celebrate her bachelorette party. The fun quickly turns into a struggle when Casey is bitten by something mysterious while swimming in a waterfall.

Returning home from the party, Casey wrestles with guilt over her experience in Costa Rica, especially after waking up on the beach without her engagement ring. She doubts her feelings about marrying her fiancé, Jared.

Shortly after returning, Casey notices red marks spreading across her body and begins experiencing strange symptoms like vomiting a viscous substance. Her situation escalates further when a festering pustule erupts while she is intimate with Jared.

Cyrano, the dog belonging to her neighbor Mr. Matheson, refuses to go out for his regular walk with Casey, signaling something is wrong. This strange behavior adds to the growing unease surrounding Casey's condition.

After seeking advice from a dermatologist about her bug bites, Casey learns she is pregnant, presumably from her encounter in Costa Rica. This news complicates her already tumultuous feelings about her marriage to Jared.

Casey's mutation accelerates as she begins to lay hundreds of insect eggs, transforming her apartment into an organic hive. She becomes increasingly consumed by her condition and avoids confronting Jared.

Mrs. Kennedy, Casey's disapproving mother-in-law, comes to investigate complaints of a foul odor emanating from Casey's apartment. In a shocking turn of events, Casey inadvertently coughs up an acidic substance that fatally injures Mrs. Kennedy.

As Casey continues to transform, Jill expresses concern over Casey's absence, revealing she had stolen Casey's engagement ring while they were in Costa Rica. The betrayal adds another layer of tension to the already strained relationships.

Kirsten visits Casey's evolving apartment and is horrified by the sight of the organic growth and Mrs. Kennedy's corpse. In a desperate attempt to escape, she tries to call 911 but is silenced by Casey, resulting in her untimely demise.

Jared starts experiencing symptoms of his own as he pees blood, leading to a confrontation with Jill. They engage in a secret affair while the haunting reality of Casey's transformation looms over them.

Upon realizing the disturbing events unfolding, Jared rushes to Casey's apartment where he finds her in a monstrous state. The confrontation turns deadly when Casey attacks him, leading to a tragic showdown between the couple.

In a series of violent exchanges, Jared ultimately kills Casey in a desperate attempt to save himself. Left injured and bewildered, Jared stumbles back to his apartment, where he too succumbs to the effects of their shared horrors.

A week later, a hazmat team arrives to process both Casey's and Jared's apartments, which have transformed into insect-infested lairs. The presence of hatching eggs signifies that the terrifying legacy of Casey's condition lives on.

Hannah jogs with a friend and encounters an unsettling reminder of the previous events when her friend gets bitten. Hannah calms her, demonstrating the normalcy of daily life amidst the chaos that unfolded in Casey's world.