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When an alien named Doodo mistakes Chris for an intergalactic Emperor, Chris goes along with it, thinking it will be fun. But things quickly get out of hand when the MBC discovers that there is an evil alien named Krungnar who is out to mandelbark the emperor's flaggins.

Little John inadvertently subjects the MBC to the effects of his truth ray, causing them to suffer strange physical effects whenever they lie. This complicates their efforts to subdue an intergalactic villain. Meanwhile, Danny gets an opportunity to work with Wendy on an assignment - "Life on Other Planets: Fact or Fiction." But his inability to lie causes big problems for him as well.

When Danny and Sam mess up a few assignments, the IGA commander sends down two droids to assist the MBC. But, while Chris and Cathy get along with the new recruits, Danny and Sam suspect that they're up to no good. Meanwhile, Mr. Smith recruits the MBC to help him plan Cathy's "Sweet 250" birthday party.

A group of bubblegum-like aliens come to earth to seek refuge from their planet (Bagumblia) which is suffering from global cooling. Their leader is angered when Danny inadvertently chews him and declares war on humanity, taking Mark as their hostage. The Baglumbians threaten to unleash their hideous mastication monster on Mark, and the MBC must leap into action to protect him.

The MBC investigates a strange caveman-like alien that has come to earth and is reaking havoc around the school. Krog's destruction seems to be random, until they discover what he's really after - the hand of Principal Rollins! Meanwhile, when the MBC decides that Sam needs to "lighten up" a bit, Cathy takes it upon herself to try some strange Rhapsodian techniques.

When Singletown experiences some strange weather patterns, the MBC discovers that the entire town is covered with an alien Jellynerp. The creature was placed there by the local weatherman - actually an alien - who is tired of reporting the weather and wants it to be the same every day. A sound plan, except for one minor detail: now the Jellynerp is hungry and it's starting to eat the town!

The MBC unearths a time capsule left behind by the original MBC, warning of an attack that is due to take place in the future. The MBC receives a series of encrypted clues, which they must follow in order to avert certain disaster - in the form of all the aliens being released from the containment grid! Meanwhile, Mr. Smith's sister Frida shows up for an unexpected visit.

An evil Lizard creature (hell bent on eating the precious Mobotto Flower) performs an alien mind meld on Danny and the two end up switching brains. While Danny tries desperately to warn the MBC, he falls into the clutches of Roy and Ralph who try and make him into a circus lizard.

When Singletown goes into an unexpected deep freeze, the MBC suspects alien activity. It turns out that Pizmo, a reformed eater alien, has turned the town into his own personal workout facility. He's created a cooling machine so that he won't sweat during his insane workouts. But now the cooling machine is out of control and threatens to throw Singletown into another ice age.

When Jeremy accidentally comes in contact with an alien substance, he undergoes a strange transformation - turning into a hideous monster whenever he sees anything Rhapsodian. The MBC must figure out how to reverse the effects before Jeremy destroys everything. Meanwhile, Sam gets blamed for injuring Mark and Rollins forces her to assist Mark with his hideous science project.

When the MBC breaks the record for "monsters busted in one month" they receive a reward from the IGA commander - flying lessons on the ultra-cool V-9 spacecraft. But, as it turns out, the flying lessons are all a ruse. It's a plot by their old friend Herptilius to kidnap the MBC and ship them off to an intergalactic barbecue... where they will be the main course!

Glutin the Sticky alien returns to Singletown Middle School and he's out to bag himself a Rhapsodian. The MBC immediately assumes he's after Cathy, but they're mistaken. You see, during a mishap in Fuster's class Cathy's powers have inadvertently been transferred to Wendy! The MBC has to try and reverse the effects before Wendy gets out of the school... or gets captured by Glutin!

The MBC investigates when people start mysteriously disappearing all over town. It turns out to be the work of "Beady" - the evil twin brother of the speed morpher, Speedy. He's determined to set up a museum-like exhibit of "The Galaxy's Strangest Creatures" and tour around the universe.

Mr. Smith surprises the MBC with a special performance by a great magician - Rhubarb the Remarkable! However, the gang is shocked to learn that Rhubarb is actually a "reformed" bad guy that they defeated in episode 10 - Wedge, the talent agent. They're suspicious of Wedge right from the start... and with good reason.

Mr. Smith puts the MBC in charge of protecting a small black orb. What they don't know is that the orb actually contains an entire galaxy! And things get really tricky when a vicious spider alien confuses the orb with her missing egg! Meanwhile, Mark challenges Danny to a bowling competition on his own private bowling lane.

Mark finds a "training tape" of the MBC kids and tells everyone in school about the alien-fighting club. With their secret discovered, the MBC kids are idolized by some classmates and jealously mocked by others. Several vengeful aliens also learn the kids' identities and set out to destroy them.

While Cathy and Chris battle the ever-increasing Annihilator forces in the present, Danny and Sam are in the past trying to alter the course of the future and prevent Mark from ever getting his hands on the tape. However, their efforts keep failing and, back in the present, the Annihilator mother ship has arrived with its Death-Star-style beam to flatten the town.

The MBC encounters a weird-looking alien, Mimi, who seems to get everything ready for a wedding in Singletown.

An exciting event takes place in Singletown: a solar eclipse! Soon, this exciting even turns out to be more than just exciting: completely weird! The eclipse doesn't end and Singletown become the target of an alien who wants to turn it into a giant night club! At the same moment, Cathy gets assigned a new mission from the commander that she has to succeed if she wants to keep her club membership!

Random objects begin to disappear around Singletown, and some objects end up in the weirdest locations! The MBC investigates and soon discover it's the work of an very tidy alien who's only goal seems to clean up Singletown. All of Singletown is threatened to be turned into a spotless town, humans included!

Gilbert is back to Singletown! Having learned his lessons from the previous time he was in town, he comes bringing a "Thank You" gift for the MBC, but unfortunately things go a little out of control! The MBC have now to face a laughter epidemic !! At the same time, Mark needs to get a computer from Jeremy and finds himself wooing Cathy so he can be her girlfriend!

King Petalia comes back to ask for the MBC's help, as he's being pursued by the evil clipper-bots again. Soon, they realize that they've been sent on a wild goose chase and it turns out that King Petalia is not nice anymore! He came back to earth to abduct Jeremy, hoping to steal some valuable information from him.

The MBC is shocked when Mr Smith's sister, Aunt Frida, comes back to visit them, except this time she informs them that...she's married! And her husband is a famous opera singer! But things are not what they seem, and Moochie is certainly full of surprises! In the meantime, Sam gets stuck with Aunt Frida who is working on a secret recipe.

Students in Singletown Middle School are thrilled to participate in the pet show that the school has organized. This year's jury is the famous Morag...but is she really famous? Why is it that no one has heard of her before? And what is the secret plan she's trying to pull up?

Doodoo comes back to earth asking for the MBC's help again. After thinking that Chris is an emperor, he's now asking Sam to pretend she's a princess to help him solve a crisis with the Dundethunkers that threaten to eat the planet! Yet another mission for the MBC!

Could it be that the MBC will be eliminated? After a virus breaks out in the club, the MBC is put on quarantine and sent up in space. They only have a few minutes left before the clubhouse implodes!