Jerry's father is a creative genius, always thinking of ways to make life more interesting. But when he starts building a jungle gym that gets taller and taller, twisting all the way up to the sky, the soaring spectacle makes Jerry seriously squeamish.

Jerry's jungle gym jitters get worse when he sees fearless friends and acrobatic animals hanging from tires and riding through tunnels. The overgrown obstacle course is scary enough for Jerry, but when a fire traps his daredevil sister in the towering contraption, only Jerry can save her. Can he summon the courage to rise to the occasion, or will the jungle gym jitters paralyze him?