Circle

They were abducted by aliens. Eric recalls attempting to flee Los Angeles when he was pulled into the air and woke up in the red room with other humans. The experiment appears to be conducted by extraterrestrials studying how humans make moral decisions under extreme pressure.

Earlier, the oldest man claims he saw aliens and is later killed, hinting at the true nature of their captors.

The room's technology allows participants to vote for who dies using hand gestures. Arrows on the floor reveal each person's vote to themselves but not to others. A death occurs every two minutes regardless of whether they participate. Anyone who tries to touch another person or leave their platform triggers an instant lethal beam from the central dome.

The system was revealed after the first few deaths when the group discovered the arrows appearing on the floor.

Eric's faction deliberately protected the pregnant woman and little girl, viewing them as the most vulnerable. The opposing faction led by the bearded man argued everyone should be equal with no special protection. The pregnant woman survived because Eric's sacrifice-focused faction won the voting war, keeping her and the girl alive until the final rounds.

The faction split was foreshadowed when Eric first proposed the elder elimination strategy, showing his willingness to protect the vulnerable.

At the very end, Eric votes to kill the pregnant woman to end the cycle. However, he learns that the unborn child counts as a separate person. Eric then votes to kill the child as well. Both the pregnant woman and her unborn child die, though Eric wakes up in Los Angeles afterward.

Earlier in the film, a man tried to give a second vote for the pregnant woman, establishing that she and her child were considered as two people.

The girl killed herself to buy more time for Eric and the pregnant woman. With only four people remaining and the two-minute deaths continuing, she chose self-sacrifice to potentially allow one of the others to survive the cycle.

Earlier, group members had begun sacrificing themselves voluntarily to give others time, establishing this as an accepted strategy.

Eric theorizes the aliens were using the voting game to study human morality and values. The entire scenario was a controlled test to observe how humans behave when forced to make life-and-death decisions about strangers. The ending reveals the aliens have been monitoring Earth, suggesting this was one of many experiments conducted on humanity.

Eric's theory about alien study is foreshadowed by the oldest man's claim about seeing aliens and the seemingly arbitrary yet psychologically revealing nature of the deaths.

Eric remembers being abducted while trying to flee Los Angeles. He was pulled into the air and woke up in the darkened room. The oldest man also claims to have seen or heard aliens before his death, confirming extraterrestrial involvement in bringing the 50 people together.

Eric's memory of being abducted is triggered early in the film when he begins questioning how they all arrived.

The group began targeting minorities as fear and prejudice took hold. An African-American man accused the process of becoming racist, and when a cop launched into a racist tirade, the group selected him next. The film demonstrates how under extreme pressure, existing societal prejudices influence decision-making.

Earlier votes already showed bias toward the elderly, establishing that the group would target those perceived as different or less valuable.

The death cycle continued regardless of whether participants voted. Even when the group attempted to boycott the voting process, a person still died every two minutes. The dome's technology forced the outcome, making the vote mandatory for influencing who would be selected.

The first attempt to boycott happened early, when a man tried to calm the crowd and was killed mid-sentence, showing the dome's ruthlessness.

The silent participant never cast a single vote during the entire game, making him a pivotal figure. He was eliminated late in the game, leaving only Eric, the pregnant woman, and the girl. His refusal to participate highlighted how some people chose not to contribute to the moral corruption of the system.

His silence was noted by other survivors throughout the film as an unusual and noteworthy choice.

After the final votes, Eric wakes up back in Los Angeles. He joins a group of people, mostly children and pregnant women, watching alien crafts hovering over the city. This reveals the experiment has ended and shows the aliens' presence is now visible to the public, though many questions about the experiment's outcome remain unanswered.

Eric's theory that aliens were studying humanity is confirmed when he sees the alien crafts above Los Angeles.

A man and woman in the circle pretended to be husband and wife to gain favor and potentially receive protection from the group. Their ruse was discovered when the husband was forced to align with Eric's bloc, and under interrogation, they admitted the relationship was fake and designed to curry favor for survival.

Their closeness was noted earlier when others recognized them as a couple, making the reveal more impactful.

A lawyer who targeted a lesbian participant for being gay was killed as a consequence of the escalating mob justice. The film shows how personal prejudices, whether about sexuality, race, or age, directly influenced who survived the voting, turning the experiment into a mirror of society's biases.

Earlier incidents of targeting based on personal characteristics established that hatred would have fatal consequences.