Martin, Diana, and Java investigate a small western town in Utah whose entire population seems to have disappeared overnight. Suddenly, the people return to the town, but they all seem a little different.

Martin and the gang are off to France to check out the mysterious disappearance of two teens on a boat ride. When they learn that one of the missing teens works at a surf shop, they head there to check it out, and find a vampire who is sucking the souls out of people. She captures Martin, who is revealed to be the descendant of her husband, and forces Diana, Billy, and Java to go and rescue him before the vampires can unleash their brethren from the Banished Realm.

People living in New Mexico near the Los Lunas nuclear power plant wake up w/ missing hair and teeth, and also seem to be appearing in two places at once. When Martin, Diana, and Java arrive to investigate, they find some evidence of alien involvement that freaks Billy out and forces him to reveal his hidden past as Ganthar, the leader of a gang of extraterrestrial pirates.

M.O.M. reveals Billy's hidden life as Ganthar, destroyer of worlds, before he abandoned his old name, form, and way of life and joined the Center. She sends the gang to trade the captured aliens for Billy, unaware that once the aliens reunite, they will be able to call in reinforcements and destroy the Earth! The only one who can stop them is Billy, but to do that he will have to become Ganthar again— and he might not want to change back.

After an incident at the school library Martin claims Diana is a \"goody two-shoes\". So she drastically changes her image in order to prove that she can be a bad girl when she wants. At the Center Mom tells them that there was a bizarre attack on the mayor or Stillwater, Louisiana by an invisible force and sends them to investigate. After a few more weird events they discover that a corrupt politician is using Voodoo Dolls to eliminate his competition. He intends to win the mayoral race and end up in the mayor's office. An office that was built to conceal an evil Shaman's lair. Once he harnesses the power of an ancient artifact hidden below he will become an unstoppable voodoo priest!

At a Sydney, Australia museum, a robber is surrounded by a mysterious green mist. The group is sent to investigate. They discover that they were up against a genie who wanted to cause chaos all over the world. Java and Diana are rendered helpless by the genie's power. Can Martin stop the genie before it's too late?

Martin, Diana & Java are sent to a Caribbean resort where people have gone missing. They find that the resort is actually run by shapeshifting zombies who are sacrificing the vacationers to a sea creature called Hexan.

Looking for two missing Center agents strands the gang in the long lost underground city of Alpha-Omega. The Alpha-Omegans mistake the bald headed Diana for their missing Queen and the sign they've been waiting for to begin their conquest of the surface world.

Martin's attempts at filming his own horror movie are interrupted when a giant ant emerges from the screen of the local Drive-In which is showing an old sci-fi movie about giant insects. Martin and Diana soon discover a 500 year curse is bringing imaginary monsters to life and since Java was playing the creature in Martin's movie he's been transformed into a real radioactive swamp zombie. To make matters worse if the monsters aren't all defeated by sunrise they'll become indestructible and Torrington will never be rid of them.

While Marvin has left Torrington, Martin is irked that everyone "particularly Jenny" is still talking about him rather than paying attention to his extreme sports stunts. So his jealousy kicks into overdrive when he discovers that M.O.M. has made Marvin a Center agent and assigned him to work with Martin and Diana on their latest mission to investigate odd incidents at the Scopes Institute "a school for the blind", located in British Columbia. With Marvin out to flaunt his superiority, Martin seething with jealousy, and Diana drooling over Marvin, is anyone on the team focused enough to figure out what is really going on before the banished sorcerers called the Seers succeed in returning to spread chaos across the Earth?

When M.O.M. ceases to return from her Jamaican vacation, Billy calls in Martin, Diana & Java to investigate. They uncover what M.O.M. was really up to – she was on a secret mission to unlock the Gateway.

Things are looking pretty final as monsters appear all over the world and overwhelm all the Center agents while the now evil MOM and the Gatekeeper unite to destroy Martin, Diana, Java and Billy. Is this the end of the line for the gang and the Center?

While sick with a mystery illness Martin, Java & Diana are quarantined in the Center's medical wing and reminisce about their past adventures. Due to a misunderstanding they think MOM has decided to terminate them before they can spread the sickness and flee deeper into the Center unaware that the real cause of the alarm is that the Boogeyman has escaped and they're heading right for him!

A lonely girl at Torrington finds a mirror that makes her pretty "like the Jenni's of the world" but every boy she touches turns into a monster.

A boy in a town, discovers a mystery website who has trapped an evil alien that uses the energy of others to get out of his web prison.

A boy decides to raise sea monkeys, but when the sea monkeys do not appear he flushes the packet down the toilet, where they reach polluted water and become sea mutants.

Martin orders some paranormal objects of a magazine, all result fake, except one which, when Diana breaks it, creates another Diana.

Torrington's old biology teacher, Mr. Black, allows himself to be bitten by a spider, transforming him into a half-spider half-human creature to get revenge on the staff who forced him into retirement.

Some teens stole a lawn gnome from an old lady's garden in Ontario. The gnomes come to life and turn everyone into lawn gnomes until they get the missing gnome back.

Martin is scratched by a Phantom Werewolf when he cleans out the CENTER's cages. Soon, the Phantom Werewolf breaks out and begins turning other Torrington students into werewolves to serve it.

Martin's dad accidentally releases and gets swallowed by a prehistoric worm which Martin had already caught. Worse, if he doesn't stop the worm soon, his father will become the worm forever.

They find that a previous French owner used a talisman to make the farmland his own for good. The scarecrow in Martin's aunt's garden scarecrow starts to literally scare the life out of anything that trespasses.

A teenage girl's teddy bear turns vicious and starts turning her once-friends into doll replicas.

Martin releases an evil warlock in order to win a competition.

go with M.O.M on a six-day corporate retreat, a bad storm comes and they are forced to take shelter in a creepy old abandoned house. What they don't know is that the man who built the house is a spurned lover who still hasn't left...and doesn't want to let them leave.

Martin, Diana, and Billy are confused when one day they wake up to find themselves the only ones on campus...and the world. They soon meet Kaitlin, another confused person who turns out to be almost like Martin's clone. They find Billy after Diana disappears into a black hole, and find out that people's own shadows are attacking them and dragging them into a strange shadow world.

Kaitlin has fallen victim to her shadow, and as usual, it's up to Martin and Billy to save the day. They've found out that since the people who were safe slept in the light, that's the thing the shadow creatures are afraid of. With the help of the Legendex, they realize that the shadow creatures' leader, Barock the Faceless, wants to take over Earth, but needs all the humans in his realm before he can crossover—and when he does, the gateway will forever close. When Billy's gone too and Martin is the last being on Earth, the showdown begins.

Martin and schoolmate Jerry are chosen to join a secret society, The Bones, where membership entails cool powers like telekenesis and free stuff like extra dessert and sports cars. Both are thrilled until they find what awaits them in their "entrance test"...

A student's plant experiment for the Science Fair goes awry and the plant starts to eat the competition and anything that gets in his way.

A famous writer, Evan Prince, gives Martin a typewriter...without telling him that the stories Martin writes will actually come to life.

Martin goes on a school trip to a museum where there is an exhibition of pirates, and he decides to see where are the things of an old pirate that was told to have supernatural powers. Taking a medallion with him, Martin, or maybe \"Captain Blood\" now, is out to find the treasure that can raise the spirits of his crew.

Billy, and Diana decide to take Martin to an amusement park for his one-year investigator reunion, but in this park the things come alive by an Egyptian spirit that thought a ride was the tomb he was guarding.

Diana is ticked off with Martin and Kaitlin, and the djini uses this to her advantage as she possesses her with an enchanted bracelet.

Marvin escapes an angry leprechaun and call Martin and Diana for help. it turns out that Marvin is keeping for himself a mystic four-leaf clover the grants the holder limitless good luck and the Leprechaun wants it back.

Martin, Billy, and Java start their own band to attract the girls. But Martin finds out that his new electric guitar is possessed which transforms his girl fans into love monsters.

Diana resigns from the center for not having a good evaluation and joins a rival paranormal organization called the CIHL and starts stealing Martin's monsters.

Marvin escapes from an angry leprechaun and calls Martin and Diana for help. It turns out that he was keeping a mystic, four-leaf clover that grants the holder limitless good luck. and that leprechaun wants to take it back.

Martin is reunited with his first crush, Vivian Michelle, who embarrassed him during the grade school times. Martin tries to avoid her, but when he finds out that Vivian has changed, he changes his mind about her. Diana suspects that Vivian is different due to her strange skin. Vivian is actually Venoso, a mutated chameleon who was the first monster Martin ever caught, out for revenge.

Martin and Diana are stuck at school for Christmas until MOM invites them to the Center's Christmas party. All goes well, until an Evil Elf intends on ruining everyone's Christmas by twisting their Christmas wishes.