Spencer Armacost, an astronaut, embarks on a critical space mission alongside his colleague Alex Streck. During the mission, they lose contact with NASA for two minutes. Upon their return to Earth, Spencer's wife, Jillian, notices unsettling changes in her husband, who remained unconscious for a short period after the incident. Despite doctors clearing Spencer, Jillian becomes increasingly disturbed by his altered behavior and demeanor.

As Jillian navigates her growing unease and suspicions about Spencer, the couple learns they are expecting twins. Jillian's sense of dread intensifies when she starts experiencing vivid nightmares and encounters strange, sinister occurrences. Desperate for answers, she finds it increasingly challenging to reconcile the man he once was with the individual living under their roof now. As she delves deeper into the mystery surrounding those two crucial minutes in space, the true nature of Spencer's transformation threatens to unravel their lives completely.