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A new girl name Jenny comes to school and turns out to be an octo-alien, so the MBC Members must put an end to her. (E03 on DisneyXD USA)

Mindreader

Cathy's cousin Elton comes to visit. The rest of The MBC Members discover he is a mind reader and he uses his power to annoy and embarrass them. The MBC Members later find out that Pincher-Bots are after Elton and they must protect him. (E01 on DisneyXD USA)

Wrong Number

Hugo is appointed a job in which he has to make peace between two planets before they go to war. He is given a galactic communicator that looks like a cellphone. Due to Chris' curiosity, he takes the communicator and loses it when he crashes into Mark and the devices get mixed up. Mark keeps getting the calls meant for Hugo and insults Zubin. The two planets go to war on Earth. Soon after the space ships arrive, Chris and Cathy get back the communicator and make peace between the planets. (this is episode 04 on DisneyXD USA)

Snack Time

Sam helps babysit toddler Tina, a Pythenor Eater alien, for Cathy while she still has to help with the bake sale benefiting hungry whales with Chris and Danny, making her go back and forth to each job. With all the stress, Sam accidentally feeds Tina Glusock crackers, an alien food that Pythenor Eaters shouldn't eat because it puts them on an eating rampage! Meanwhile, Chris and Danny are having trouble with Mark's Everyday Airlift Bake Sale raising money for Mark to have a helicopter. Tina gets to the school and starts eating all the bake sale goods but is momentarily stopped by a Floater Disk, but she can even eat food without touching it. Hugo tells them that the only way to stop this rampage is to get the taste of Glusock out of her mouth, so they use John's "Dumdy Dum" delectable dispenser, which produces bad tasting cookies and stops the little Pythenor Eater. (this is episode 05 on DisneyXD USA)

The Trouble With Troublemaking

Cathy gets detention when she fights with Mr. Fusster about intelligent life other than humans. The detention teacher is Mr. Gluten and it turns out to be a Sticky glue alien. To solve this problem, Danny says to fight the alien they should all get detention, which Chris and Sam don't like since they never get detention, unlike Danny. Chris shows up the next day with a gangster look, but still is finding trouble getting detention. Cathy and Sam look for Mr. Gluten's file and escape once they find it. At lunch, Mr. Gluten turns into the lunch lady and Chris and Danny call for help. When Mr. Gluten escapes, Sam tackles the real lunch lady and gets detention. At detention, Sam finds out the real Mr. Gluten is on vacation. When the Sticky attacks and tells Cathy and Sam he is recruiting alien workers and that he is gathering Rhapsodians A.K.A., Cathy to work for him. Just as he is about to capture Cathy, the boys throw a stink bomb and the Sticky escapes into the forest. The MBC Members follow him and stop him by using a Rhapsodian puzzle stick that Danny sets between two trees to trip him and knock him down. Chris hacks into the student files and clears their detentions, so that Cathy and Sam have clear student records. (this is episode 06 on DisneyXD USA)

Dog Daze

Wendy asks Danny to look after her dog named Matisse, while she is on a trip to the mountains. In order to impress Wendy, Danny signs Matisse to behavior-correction school where Matisse is replaced with moto-dog, things start to get complicated and it's up to The MBC Members to save Single Town from Matisse moto-clones. (this is episode 02 on DisneyXD USA)

Flower King

The MBC Members Members get a new mission. They must guard The Flower King named Petalia XIV, who is in the form of a flower until ambassadors from his planet arrive. Meanwhile, Jeremy is trying to impress Cathy by presenting her a flower. He accidentally mistakes Petalia for one and kidnaps him. Now, the MBC Members have to deal with both robots sent to capture Petalia and finding Petalia himself.

Battle of the Bands

Several tweens in Single Town including Ralph, Danny and Wendy were found robbing local shops. Soon, The MBC Members realize that all robbers were hypnotized during the recent concert of a band called "The Flying Dutchmen." Now, they must become a band to participate in upcoming concert and put an end to the hypnotic music.

World's Toughest Kid

The MBC Members try to use the interplanetary transporter to send several captured aliens to the galactic authorities, which requires the retinal scan of all of The MBC Members to complete, but Danny is running late. The transport fails, which results in a battle with accidentally freed aliens. Meanwhile, Cathy prepares herself, with Sam's help, for a Student Council President, but both she and Danny, in a matter of coolness, face opposition of new tough schoolboy, Brian. Now, it is up to The MBC Members to investigate why Brian challenged Danny and Cathy. (this is episode 10 for DisneyXD USA)

Acting Out

In the cafe, The MBC Members fights a lizard-like alien, who is trying to kill a stylish guy. The lizard alien escapes, and The MBC Members meet Stanley Caminski, one of the galaxy's most successful superstar manager. For saving his life he explains that attacking alien was his unsuccessful competitor, whose stars aren't popular. Stanley offers The MBC Members his assistance so they can become stars too. Everyone agrees, but Hugo says no, because Monster Buster Club is a secret society and must not be revealed. Chris, however, secretly calls Stanley and agrees to participate in commercials. Meanwhile, Cathy auditions for the school play, "Romeo and Juliet" and turns out to be an amazing actress, so she wins the part and must prepare for opening night. Wedge, the lizard alien, is looking to kill every superstar who works with Stanley. Now, with Cathy too busy, and obsessed, preparing for the school play, and Chris not wanting to believe that Wedge is after him, it is up to Sam, Danny and John to find Wedge before he strikes. (this is episode 09 for DisneyXD USA)

Monster Beaters

John tries to convince The MBC Members, including his older brother, Chris, to allow him to join, but they reject him because he is too young. However, a new monster fighters club called "Monster Beaters" appears in Single Town and John is welcome to join them. Meanwhile, the school opens several new after school classes or clubs and everyone must join one of them; Sam and Danny get into knitting club; Cathy is assigned to science club; Chris forced to visit a tap dancing club. The MBC Members soon get to the truth about the Monster Beaters – they're aliens. John, however, doesn't believe Chris and continues to work with Monsters Beaters. Will The MBC Members be able to save John from the aliens before it's too late? (this is episode 12 for DisneyXD USA)

Comic Book Heroes

Cathy and Sam are angry about seeing so few comic books about women. While a mysterious man runs out of the local comic book shop, they pursue him but he gets away. Meanwhile a strange new boy appears at their school, trying to make kids follow his orders to prepare all his comic book collection from the other planet to be stored on the Earth, making Sam follow his orders too. With Cathy busy imitating one of the comic book heroines, will The MBC Members be able to save kids from the mysterious boy alien? (this is episode 11 for DisneyXD USA)

Statue Of Limitations

Sam volunteers to prepare a celebration of the day, when city was founded by a man named Addison Single. Cathy, however, proclaims Addison was an alien who tried to make this city for aliens. Sam refuses to believe it, but soon deep in the abandoned MBC storage beneath their clubhouse, where Chris accidentally activates a violet gemstone bringing the statue of Addison Single to life, which is revealed later that it is not a statue, it's the founder himself. Now The MBC Members must stop the statue from turning all citizens into stone, while keeping them busy so that they will not notice. (this is episode 15 on DisneyXD USA)

Pipe Dreams

The MBC Members take a fun-ride through the underground tunnels when the pipes begin to shake. However, they discover that road workers are causing it, but soon they turn out to be following new plans for digging new sewers. Meanwhile, Mr. Fusster takes the class sightseeing in the sewers. The MBC Members realize that class may discover club's tunnels which intersects with the sewers. Sam decides to scare everyone off so their club will remain undiscovered. However, things get worse when the strange "road worker" turns out to be an alien who tries to "suck" the entire town into the big prototype of MBC's tractor beam using the club's net of tunnels. Will The MBC Members be able to stop him before he succeeds? (this is episode 16 on DisneyXD USA)

Aliens on the Fast Track

Chris has a part time job spring cleaning a shop. His boss nags him to make sure he finish or he'll be fired. Meanwhile, his friends come in to visit and suddenly their communicators detects an alien coming into the shop and The MBC Members try to power up, but they are not as fast as him. In only a few seconds, all items in the shop disappear and his boss nags him again and suspects that his friends stole all the items and must either get all the items back to the shop or pay for them by 6 pm or else he'll be in big trouble. A second later, Danny's video game is also stolen. Soon after that Sam, Danny and Cathy are going for a part time job try to repay the money for the stolen items, but later, all of Single Town's electronic devices disappear, including the MBC container! Can The MBC Members find this Speed Morpher alien before Single Town is in chaos? (this is episode 13 on DisneyXD USA)

Secret Santa

It is time to start a snow holiday and Chris, who loves the winter holidays, tries to figure out what kind of present he is going to get. Cathy doesn't know about Santa because she does not know that Earth also has snow day. Trouble comes in the form of Roy's present when it is revealed that it is a tracker planted by Dingle, an alien disguised as a Santa who is trying to bring all the kids, including Sam, to an old air container, making it look like he is trying to take the kids hostage. But afterwards, it is revealed that Dingle was just trying to get the kids to accept his presents. (this is episode 23 on DisneyXD USA)

The Bugaboos

It is a good afternoon and everyone is coming out for a walk and to study. Danny is skateboarding and showing off while Chris is working on his project, thinking he can finish before night falls. A bug scout sees everyone and Chris tries to drive him away. The bug ends up throwing him and causing an accident with Danny on the skateboard park, making Mark laugh at him. Soon, as they walk down the street, a swarm of bugs attacks The MBC Members. Danny catches a General bug, named General Louse but the swarm continue to attack forcing them to retreat back to their club house. Cathy tells everyone that Hugo is seeing Principal Rollins and she thinks she'll be getting detention. On the street, they are attacked by a swarm of bugs again. After a while, it reveals it's an alien bug and The MBC Members find out that their bug queen is coming to lay her eggs. Can they stop the queen before she arrives? (this is episode 14 on DisneyXD USA)

The Forget-Me-Stone

One quiet single night in Single Town, Hugo and his plant playing a cards game in his house when there's trouble, an alien called Glor Glenemore is there to steal the Forget-Me-Stone, which causes chaos when it is activated and erases the memories of those who touch it. When the Glor Glenemore, who tries stealing The Forget-Me-Stone, suddenly he drops it in the middle of Single Town Middle School. Mark finds the stone and touches it, erasing his memories and even worse when he brings to school and lets everybody in the school touch it and erase their memories. Can The MBC Members track down Glor Glenemore and help everyone to recover their memories every people before all were turn into chaos? (this is episode 17 on DisneyXD USA)

Camping Out

It is another single night in Single Town while the MBC Members are chasing a small Robotic machine, that has stolen electronic devices with the car, while only halfway into the chase, their arsenal has no more power so the small Robotic machine escapes. When they're back at their club house, the power is very low and Sam shuts it off or else no more power to recover it, but it will take more than a month to recharge it. She worries that there will doom if it doesn't recharge in less than a week, the whole world will be the alien's home. Suddenly, Hugo invites the MBC Members, including his granddaughter, Cathy, to go camping. So they go to Rocky Mountains Hill, to find an energy flower (The Mobato Flower) which can restore the club in full power, which only grows every four centuries. At night a monster appears at their camping zone and eats everything in the backpack. They must overcome the monster and cross mountain after mountain to claim the Mobato Flower, but the monster reaches it first and tries to claim it, The MBC Members have no choice but to fight for the flower. The monster is revealed to be just a paper machine with a small Robotic machine inside. The MBC Members bring back the flower to restore their club to normal. (this is episode 18 on DisneyXD USA)

Trick Or Treat... Or Alien

It's Halloween and all the kids in Single Town are going trick-or-treating. Mark challenges Danny to go into the haunted house alone. In the end, Danny would be the first kid inside the haunted house. When he goes inside, there are a lot of spooky things happening to him: books flying around, the wall moving itself, he goes into the room and was trapped by the sticky on the floor. He tried to escape, but it didn't work. He alerts the other MBC members to save him. While Danny is trapped inside the haunted house, Chris, Sam and Cathy are going Trick or Treating, when suddenly their communicators get a transmission from Danny. They speed their way to the haunted house to save him. Finally, they reach Danny and try to save by using arsenal to break free from the sticky, which he has hold. When suddenly the floor is alive by itself, everyone is trying to get ready for battle, but after a while it reveals itself as a giant alien pet dog named Moppy, who has been lost on earth many years ago. The aliens of the Nix pet told them about the situation, his pet puppy's space ship only arrives on Halloween for their return to their planet. If this year ends they have to wait another year and he tells The MBC Members that the spaceship arrives somewhere in the single people home swimming pool. So The MBC Members hurry up and carry Moppy, and speed their way to the space ship with the help of John, they're aware of people in Single Town will see the alien's pet dog. After all a long way, they finally reach the pool, but Moppy refused to go in the space ship. So, Danny uses his skill to attract the dog to space ship, Nix is very proud of The MBC Members and thanks them for bringing back his pet to their space ship. He will meet them again on another Halloween and they fly back to their planet. (this is episode 19 on DisneyXD USA)

A Matter of Principals

Danny is picked to be principal for the day, and has great ideas on how to improve the school. However, an evil dinosaur-like alien pretends to be Wendy, and attacks Chris and Cathy. Meanwhile, Sam is trapped by the real Wendy, who wants to be 'Miss First Aid of Single Town Middle School' when she falls over while running after her bus. (this is episode 20 on DisneyXD USA)

Sore Winner

A game-obsessed alien (Proskar) comes to Earth, to find a game board called 'Parchugal', and The MBC Members find weird symbols in the ground. The alien then comes and tries to take the town square away. (this is episode 30 on DisneyXD USA)

Beware of Frogs

A mutated Earth frog (Herptilius) comes to Earth to seek vengeance on a chef that nearly cooked him years ago. Coincidentally, the chef turns out to be a replacement of Mr. Fusster (Who is on holiday) for science. The MBC Members must stop the frog, but he's invincible against anything, apart his weakness of Earth flies. (this is episode 21 on DisneyXD USA)

Outcracker's Badland Galaxy Tour

Cathy invites her favorite TV star to Earth (Outcracker), who tries to get good footage of dangerous stunts, which is disastrous. First, he tries to attack Mark with a robot Juice machine. Then, he has Wendy holding on for dear life when he takes off the bottom of her hot air balloon. Danny then jumps from the car in the air and saves Wendy the 'Old Fashioned way.' After that, he releases an army of camerabots at the satellite station. (this is episode 22 on DisneyXD USA)

The End of Everything (Part 1)

The MBC Members have to replace Hugo (as he is teaching a group of aliens how to fit in on Earth) whilst he is in an important meeting with Zubin, but before that, one of them (Nosidda) saves Chris, Danny and Sam from being driven into Outer Space. One of the other aliens is always on his V-Com (Zeborg), making them all suspicious, so they take his V-Com. Cathy is then given a strange flower, and falls in love with Jeremy, but The MBC Members get more suspicious of the other alien. They then receive a distress call from Cathy, while in her Rhapsodian and don't know who it is, so Sam and Chris go after Cathy, not knowing it is Cathy. They then see aliens not being able to morph, and realize too late that the alien really is Cathy, and now she isn't allowed back on Earth. (this is episode 24 on DisneyXD USA)

The End of Everything (Part 2)

Cathy is stuck in a container, and can't morph because of her forever flower, but refuses to take it off. Meanwhile, Elton comes to Earth to take Cathy's place. Chris then shows them who really was behind all of this, Nosidda, who is using his rescue of The MBC Members to make them think that he is a good alien. It turns out, Nosidda is Addison spelled backwards, and he is really the son of the late villainous founder, Addison Single, planning on making his late father's dream come true: making Earth the perfect planet for aliens. Meanwhile, Cathy finally takes off the forever flower and heads back to Earth to save her friends. (this is episode 25 on DisneyXD USA)