As four misfit kids vow to find their missing classmate, Major Leroy Hanlon arrives to a mixed reception at Derry Air Force Base.

While Charlotte and Will navigate their new life in Derry, Ronnie worries about her father's fate.

As the kids face increasingly terrifying experiences, Charlotte attempts to advocate for Hank, and General Shaw escalates his efforts.

As the military descends on Neibolt Street, the kids head into the sewers with their own objective.

Plagued by dark visions, Dick gets a surprise at the Black Spot. Meanwhile, the kids each face their own challenges.

A vigilante attack on the Black Spot unleashes long dormant forces. In the aftermath, Dick helps uncover another crucial artifact.

As a dense fog engulfs the town – and General Shaw pushes ahead with his mission – the Hanlons, Rose, Dick, and the kids must work together to save Derry.