Bad Milo!

A sonogram reveals a peculiar polyp lodged within Duncan's digestive tract. Dr. Yeager explains that this growth likely resulted from Duncan's poor stress management, and he is referred to therapist Highsmith for help.

Following the medical revelation, Duncan faces a daunting change at work. His boss, Phil, reassesses his role, moving him from Accounting to Human Resources, where he is now responsible for job terminations.

Duncan is made to work in a cramped office located in the men's room, emanating unpleasantness. The frustrating situation further compounds his anxiety, especially as he must coordinate with colleague Allistair.

During a family dinner, Duncan’s mother, Beatrice, encourages him and Sarah to conceive, introducing fertility specialist Dr. Tip into the conversation. The atmosphere becomes thick with tension as Duncan feels the weight of familial expectations.

Duncan, overwhelmed by anxiety, retreats to the bathroom. In a shocking turn, he suffers a violent episode as a creature emerges from his body and leaves him unconscious, marking the start of chaos in his life.

The creature wreaks havoc at Duncan's office, resulting in the murder of Allistair. The local news absurdly mislabels the event as a rabid raccoon attack, leaving Duncan confused and desperate.

Returning to work, Duncan is forced to begin layoffs under Phil's orders, heightening his internal struggle. He is also inundated with pressure from Dr. Tip to visit the fertility clinic, adding to his stress.

In a second session with Highsmith, Duncan undergoes hypnosis, uncovering that the creature escapes through his window. Highsmith draws parallels to an ancient myth, intimating the creature's appearance is linked to Duncan's stress.

After the creature murders Dr. Tip, Duncan names it Milo, developing a strange bond with the entity. This bond culminates in Milo crawling back inside him, creating a complex relationship that complicates Duncan's life further.

Duncan struggles with unresolved issues regarding his father, Roger, leading him to suggest a therapy session together. However, Roger outright rejects the idea, intensifying Duncan's emotional turmoil.

As federal agents arrive to seize the office records, Duncan is pulled deeper into the chaos caused by his job. Confronting Phil reveals that Duncan has lost his investment, leading him to allow Milo to take control.

After Sarah reveals her pregnancy, Duncan's anxiety peaks as he grapples with his tumultuous life. Beatrice unexpectedly confesses knowledge about the hereditary nature of the creature, pulling Duncan deeper into familial issues.

As chaos ensues, Duncan rushes to his mother's house, urging Sarah to hide in the basement. The climactic battle against Milo unfolds, foreshadowing further chaos as Milo attacks Sarah, leaving Duncan desperate to save her.

In a ferocious showdown, Duncan confronts Milo and ultimately manages to sever its limbs. After this harrowing experience, Duncan makes peace with Milo and turns to Sarah to offer heartfelt apologies for everything.

Duncan opens a financial consulting firm but faces lingering consequences from his past. As the story closes, it is revealed that their unborn child carries a creature of its own, hinting at a continued twisted legacy.