The Troop is in lockdown until they can figure out which one of them is really a monster.

Haley becomes suspicious when a mousy classmate suddenly gains status and power - which is revealed to be by controlling an invisible, subservient monster.

Jake learns the value of teamwork. Meanwhile, Hayley finds out that it's not possible to be liked by everyone.

On Halloween night, The Troop has to capture the monsters after the security system breaks down and the monsters escape.

Jake meets his monster-hunting hero, but discovers he's out growing the ability to hunt and capture the ultimate monster he has been chasing his whole career.

A Troop from Japan arrives to share monster-hunting techniques with our Troop, but cultural differences complicate everyone's attempts at defeating the elusive Noctem.

Jake and Hayley discover that the hot Christmas toy, the "Ickie Doll", has been invaded by a Vapor Monster, turning the dolls into nasty, violent, living creatures.

A strange Swarm monster causes everyone in town to behave perfectly, The Troop learns that perfection is overrated.

Jake and Haley must pretend to be a couple in order to catch the Eris Fairy(Victoria Justice) that's been running around the school breaking up couples in love. Felix works furiously to trap the Eris Fairy only to realize how much he relates to her situation. In the end, the fairy apologizes to Felix and tells him that she likes him.

While hunting a Vampire Moth, the Troop must alleviate the suspicions of two of their classmates who witnessed a monster fight, but cannot be Snarked.

Gus is back from the mental hospital and he plans on destroying The Troop and taking over Lakewood. But in order to do he kidnaps Mr. Stockley, to enter headquarters and release all the captive monsters.

While fighting a gelatinous cube monster, Haley and Jake accidently switch bodies.

When a veteran Troop member named Bianca Stonehouse replaces Mr. Stockley due to his dentist appointment, The Troop discover that she is a monster in disguise, there to help another monster escape and to find the real Bianca Stonehouse before its too late.

Felix's new friendship with Gus creates a rift within The Troop. Little does anyone know of Gus's secret plans to destroy The Troop.

Felix creates a robotic version of himself that is better at his life than he is, but evil. Hayley is bitten by a monster which gives her symptoms that make her seem very nerdy.

A tree monster takes the form of a student in order to kill the student council. Also, Felix is forced into a situation where he must protect a boy that has wronged him in the past.

When a group of part vampire/ part Hamster/ part Human monsters invade Lakewood, Jake must go undercover to infiltrate the group in order to find their lair.

Jake and Felix must infiltrate Hayley's cheerleader slumber party in order to find out which girl is hosting a bug alien. Also, Stockey is nervous about attending his Troop class reunion.

Mr. Stockley is the acting Principal at school and wants to the day to go perfectly to show off what he can do, but when an Oculypse escapes from HQ havoc is wreaked on the student body.

Jake is pregnant with a baby Snark, which makes his neck look weird. A griffin is harassing local ranchers and Haley and Felix have to take it out.

When Haley and Felix are scratched by a Zylork, its venom makes them want to be eaten by the monster and Jake must save his friends from themselves.

Jake is initiated into The Troop, a group that protects the town from alien monsters. His first mission is to help his mean neighbors, who have been turned to stone.

While saving a Senior Dance from a Mongolian death worm, Jake learns not to judge a book by its cover, and Felix becomes an unlikely hero.

Jake and two other students attempt to stay overnight in an abandoned hospital rumored to be haunted by a Wraith.

A Harvard-educated sponge named Dr. Cranius (voiced by Kelsey Grammer) is captured by The Troop. He then tries to manipulate the members so he can escape.