The ghost will go, but will their future be saved?

It’s time to get rid of the ghost.

Returning to the past, Griffin and Harper watch a murder unfold. The twins and Topher go to an unknowingly familiar someone for help.

In 1947, Harper and Griffin meet Ruby. Sarah becomes increasingly freaked out by the ghost.

The kids learn the ghost has been listening to them and is changing up his malevolent plans.

The twins arrive in the past and find Savannah. Griffin and Harper realize they need to go back to 1947 just as Ben makes the bunker off-limits.

Harper and Savannah retrieve Griffin from the future. Sam and Griffin face the grimmest truth, Topher is in a coma in 2024. The twins and Topher almost catch Savannah’s “ghost.”

Griffin, stuck in the future, learns the ghost ruins their lives. Harper and Savannah try bringing him back to the present.