Four friends face off against ferocious, nougat-munching monsters that lurk in the shadows of their sleepy town; they must learn to use their imaginations to unlock the magical powers of their homemade costumes and save the universe from monsters.

When the kids sneak into Nougatown to unlock the secret powers of their magic costumes, Lucy and Reynold question their ability to become monster-brawling heroes; Wren leads the reluctant group underground into the Repugnians' secret headquarters.

When all four kids get caught in Norm's anti-monster booby trap, they must work as one to escape or pay the ultimate price; Norm reveals the Repugnians' evil plan to the kids; everyone is eager to join in the fight except Reynold, who disappears.

Everett makes it his mission to become better friends with Lucy while a diabolical Repugnian scheme threatens to shut down Nougatown's famous Steel Dragon roller coaster; Wren puts the whole team in danger with a risky plan.

The kids enlist Norm to help with a secret mission at a family haunted house, but his awkwardness with the parents threatens to upend the entire spooky plan; Everett's secret plan to reconnect with his brother goes downhill fast.

Desperate to prove she's not a baby anymore, Lucy spends her 12th birthday with some unlikely party animals; the kids find an intruder trashing Norm's shop, so they costume up and grill the culprit to reveal his evil intentions.