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Young teenager Jack Sullivan and a group of friends live in a decked-out tree house, playing video games, eating candy, and fighting zombies in the aftermath of a monster apocalypse.
Desperate for a reliable energy source, Jack, June, Quint and Dirk head to the planetarium, where a generator awaits — along with something else.
The gang makes a stunning discovery at a fire station, Jack falls head over heels for a video game, and June has an urge to communicate.
Feeling June, Quint and Dirk need to stop working so hard, Jack convinces his pals to take part in an over-the-top tournament with the monsters.
Jack and the gang close in on a much-needed antenna for their radio. Meanwhile, June, Quint and Dirk experience odd visions of a dark future.
As Jack's anxiety about the future continues to grow, he and June share a moment atop a giant heap of garbage (it's nicer than it sounds).
Jack sets out to confront the Wretch, June gets on Quint's nerves, and Dirk learns of an unappetizing third test to become an honorary monster.
Everyone leaps into action when an exhausted Quint discovers that his zom-b-gone torches are offline. Meanwhile, Dirk is forced to team up with Chef.
Jack convinces June, Quint and Dirk to go to an amusement park, where the friends quickly discover they aren't the only ones there.
After Rezzoch pulls Jack into an alternate realm, Bardle transports June, Quint and Dirk in hopes they can save him before it's too late.
Finally free from Jack's head, the weary gang reinhabits their bodies only to learn that — surprise, surprise — the battle is far from over.
