All is well at Area Fifty-Something with Team Monster, until a lone alien imprisons the President and makes a permanent home on base.
On Halloween, innocent-looking carved pumpkins reveal themselves for what they really are -- mutant aliens.
The president's birthday is here! Dr. Cockroach has made him a gadget that will make him appear younger, but instead blasts him to infanthood.
After a mutant alien pumpkin explodes on the Murphy's carrot garden, zombie carrots start attacking the immediate area, and it's up to the Monsters to save the night again.
The Monsters snoop in Coverton's quarters, where they find his "cuddle bear", which then attacks everyone on B.O.B.'s commands.
Susan makes B.O.B. think that baths cure crankiness. Unfortunately, it leads B.O.B. to try to cure everyone at the base of crankiness leaps into action, including Coverton.
Link accidentally eats the gelatin that B.O.B. calls his "girlfriend", leading the gang to figure out how to break the news to him.
B.O.B. is determined to have Coverton be his emergency buddy. Instead, Coverton chooses to manipulate B.O.B. to help him steal a death ray.
Impressed with B.O.B.'s indestructibleness, Coverton decides to clone a piece of him. After too many clones, B.O.B. alarmingly begins to diminish little by little.
Sensitive data could get exposed when the monsters encounter an alien in the woods.
Link and B.O.B. accidentally launch a doomsday app.
B.O.B. is tempted to flip a secret switch.
Dr. Cockroach creates a wormhole and tries to pretend that it's a teleportation device.
Dr. Cockroach's new invention splits him into two, and the monsters try to make him whole again.
Dr. Cockroach creates a brain for B.O.B., and Coverton makes an adjustment to it by adding an evil switch to it.
A device is made to transform B.O.B. into a perfect pet, and it works on everyone—except B.O.B.
A memory extractor is created to combat nightmares spawned from scary movie night, but soon the extracted memories come to life.
Dr. Cockroach gets stronger, but his intellect weakens.
The gang go camping, which turns into a terrifying outing.
A new alien arrives on Earth searching for a vicious beast, and soon others look for him as well.
Pranks abound on the base on April Fools' Day.
Dr. Cockroach's transcript reveals he's missing a grade for a music class.
Susan spills some food on Sta'abi and says she's sorry, but Sta'abi is insulted.
Coverton has a sly plan to put bad words in B.O.B.'s vocabulary.
A living smart phone is created by Dr. Cockroach, and Coverton wants to use it to access the base's mainframe.
Sqweep makes a mess and is punished by Monger, who later commits the same crime.
Monger's secret files are uncovered, revealing details of an absent Man-Beast.
The monsters are ordered to clean up the rec room, so they recruit an old zombie to assist them.
Sqweep has to go "number seven."
Link pursues Sta'abi using a pheromone spray.
Link and Sta'abi duel for driving privileges of a new car.
When an asteroid is detected heading for Earth, Team Alien is put in charge of the rocket being sent to destroy it. Meanwhile, Dr. C sends B.O.B. to play hide and seek. Unfortunately, he winds up hiding in the fuel being used to power the rocket, and Team Monster must rescue B.O.B. and alter the rocket's trajectory so it'll actually hit its target.
Coverton tries to steal base secrets when everyone gets the alien flu.
Vornicarn's bad behavior lands him in the Isolation Zone.
B.O.B. eats Dr. C's ``probabilitator'' and foresees Coverton with a crown.
Sta'abi is summoned to embark on her Warrior Vision Quest.
Dr. Cutter arrives to update the base's technology.
Link and Bob fix up an old spaceship and take it for a joyride.
A stray kitten makes its way to the base and obtains Susan's ginormica powers.
Sta'abi recruits Bob to teach her the art of combat.
When Derek returns, strange secrets begin to unfold.
The monsters and the aliens are introduced to Rule-Bot when Monger goes away for the weekend.
Monger gathers everyone for a game of dodge ball.
Dr. Cockroach creates a spray to give the president more authority.
The monsters begin to borrow from Sqweep's allowance.
After Dr. C tampers with Sqweep's project, the alien receives a bad grade.
Dr. Cockroach accidentally teleports the diner into space.
Link is disappointed when he can not play in the government football game.
A leprechaun joins team Monster.
After seeing something horrifying in Coverton's room, Team Monster must submit to memory wipes.
Susan tries to escape the Internet.
A metal robot battles with the monsters and aliens.
