In Sheriff Boyd's absence, Donna and Kenny struggle to manage the chaos as a busload of unwitting newcomers arrives in town; Victor and Tabitha go on a chilling journey through the nightmarish labyrinth of tunnels beneath the town.

A tense night in the diner as the residents and newcomers wait for sunrise; fear permeates the wreckage beneath the Matthews house, as Jim and Tom struggle to keep a panicked bus passenger quiet.

Kenny and Ellis make a grisly discovery out in the forest; Boyd struggles with the reality of what's happening to him.

As Boyd's condition grows more alarming, Sara's return to town puts him in a difficult position; Jim shares a troubling new theory about the town.

Sara must face the music, as word of her return spreads through town; Victor and Jade strike an unlikely bargain.

Tensions run high at Colony House when word of the coming food shortage leaks out; a night at the clinic takes a terrifying turn.

Boyd and Kristi seek to capitalise on the apparent death of the Nightmare Creature; Jim finds an unlikely ally in the volatile Randall.

In their pursuit of the truth about the town, Jim and Randall hatch a dangerous plan; meanwhile, a new form of terror is brewing.

Panic spreads through town as the residents face a chilling new threat to their survival; Jim realises the magnitude of the mistake he made by enlisting Randall in his cause.

Boyd fears he may have finally run out of answers, as the residents of town prepare for the end; Tabitha clings to the belief that the children could be the key to their salvation.