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.

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 when he confronts the only thing more annoying than monsters - teenagers.

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 to use her Abe Jr. costume to meet her hero, Roody Tootz, at this year's Auburn-Con.

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 quickly grabs a bedsheet and disappears.

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. / Determined to retrieve an important item, Wren leads the reluctant group underground into the spooky, secret headquarters of the Repugnians.

The kids search the town to find this year's must-have Halloween costume, until a lurking stranger takes a special interest in their very first costume quest. / With everyone totally freaked by last night's eerie encounter, Everett leads the charge to find an adult to help solve their monster problem.