Significant Other (2022) Plot Summary & Ending Explained

Ruth pushes Harry off the cliff because the blue puddle in the cave showed her a vision of Harry's dead body encased in a cocoon, revealing that the Harry she was with was already an alien impostor. Overwhelmed by the realization that the man she loved was already dead and replaced, she acts impulsively to eliminate the creature before it can harm her.

Foreshadowing: Earlier, Ruth notices the deer engulfed in strange black substance and finds a mysterious blue puddle in the cave, these encounters hint at the alien presence before the climactic push.

• ruth
• harry
• cliff
• alien
• impostor
• blue puddle

The blue puddle is an alien substance or portal that allows Ruth to see visions of what has actually happened, specifically, it reveals Harry's dead body encased in a cocoon. This vision is what triggers Ruth's sudden change of heart and her realization that the Harry with her is not human.

Foreshadowing: The mysterious crash and the infected deer hint at alien presence before Ruth discovers the cave.

• blue puddle
• cave
• vision
• harry death

After killing the real Harry, the alien mimics his physical appearance and absorbs his memories and personality traits, allowing it to pass as Harry. The alien struggles with human emotions like love because it is experiencing feelings borrowed from the real Harry's affection for Ruth.

Foreshadowing: The strange black substance on the deer suggests some form of alien transformation or infection occurring in the forest.

• alien
• harry impersonation
• mimic
• clone

The alien cannot hurt Ruth because it has inherited the real Harry's love for her. The alien is burdened by these unfamiliar human emotions and finds itself genuinely unable to harm the woman its host loved, creating an internal conflict between its mission and its borrowed feelings.

Foreshadowing: This emotional struggle is foreshadowed by the tension in their relationship and Harry's sincere proposal.

• alien
• harry
• love
• ruth
• emotions

The alien wants Ruth to escape Earth with it before the impending alien invasion begins. It shows her its spacecraft and offers to take her to another planet, seemingly because it genuinely cares for her due to inheriting Harry's emotions. It also wants her to escape the coming destruction.

Foreshadowing: The alien's offer to escape to another planet is set up by the mysterious crash and the presence of the spacecraft.

• alien
• spacecraft
• escape
• invasion
• earth

Ruth changes her mind about marrying Harry after encountering the blue puddle in the cave, which shows her a vision of Harry's dead body. This near-death experience and the revelation about mortality make her realize she does want to marry him, but by then, she believes she is facing an alien impostor rather than the real Harry.

Foreshadowing: Ruth's anxiety about commitment is established early when she declines the proposal at the overlook.

• ruth
• harry
• proposal
• marriage
• cave vision

Ruth breaks free from the cocoon after the alien absorbs her personality and mimics her appearance. She shatters the alien's head with a rock and escapes to her vehicle. However, the alien regenerates and contacts her through the car radio, and she drives away as red objects begin falling from the sky, signaling the start of a larger alien invasion.

Foreshadowing: The earlier cocoon of Harry and the alien's regenerative abilities foreshadow Ruth's captivity and the final confrontation.

• ruth
• cocoon
• escape
• regeneration
• invasion

The red objects raining down from the sky at the end signify the beginning of a full-scale alien invasion. These are the same type of object that crashed at the start of the film, now arriving in greater numbers to attack Earth.

Foreshadowing: The opening crash of the red object into the forest establishes the alien threat before the invasion begins.

• red objects
• invasion
• sky
• aliens
• crash

The alien cocoons humans as part of its reproduction or assimilation process. After killing someone, it encases them in a cocoon, presumably to harvest their bodies and potentially create more replacements. The alien also absorbs the personalities of its victims, using their memories and traits.

Foreshadowing: Ruth discovers Harry's cocooned body through the blue puddle vision before seeing the process repeat with herself.

• cocoon
• alien
• reproduction
• harvest
• body

The deer engulfed in strange black substance is the first sign of the alien presence in the forest. It appears to be infected or affected by the alien entity, serving as a warning to the couple that something unnatural is happening in the woods before they encounter the alien directly.

Foreshadowing: The mysterious deer foreshadows the alien's ability to manipulate and affect living creatures in the forest.

• deer
• black substance
• forest
• alien presence

The alien is able to communicate with Ruth through her car radio after it has mimicked her voice and appearance. This demonstrates its advanced technology and ability to interface with human equipment, as well as its continued pursuit of Ruth despite her escape.

Foreshadowing: The alien's ability to mimic human speech and behavior is established through its impersonation of Harry.

• alien
• radio
• communication
• mimic

Ruth stabs the alien and lures it into the water, where a shark attacks it. While the alien kills the shark, the chaos gives Ruth a brief opportunity to swim away. However, the alien recovers and ultimately captures her anyway.

Foreshadowing: This desperate escape attempt shows Ruth's survival instinct, though it ultimately fails.

• ruth
• shark
• water
• escape
• stabbing