After their father leaves to attend to work, his two children and his new girlfriend, who don't get along together, become trapped at a remote winter cabin by a blizzard.

A soon-to-be stepmom is snowed in with her fiancé's two children at a remote holiday village. Just as relations finally begin to thaw between the trio, strange and frightening events threaten to summon psychological demons from her strict religious childhood.

Following the events of Avengers: Endgame, an unexpected tragedy forces a group of ancient aliens who have been living on Earth in secret for thousands of years out of the shadows to reunite against mankind's most ancient enemy, the Deviants.