Billy and Mandy are teenagers when they accidentally got transport into the Underworld where they must find a way out before the Boogey Man and Nergel will take over Endsville.

But no matter how hard I try, work, or plan, I will never be able to own an ounce of the happiness Billy contains in his soul. It is self administered. Personal. And illusive. And so, if I cannot own happiness, I will have the next best thing. [Complete]

Based on the SpongeBob episode "Rock-a-Bye Bi-Valve": Billy and Mandy are older now, and find an abandoned child. With no one to take care of him, Billy and Mandy decide to raise him as their own. But with Billy constantly working and never giving Mandy her break, tempers start flaring around the odd couple. This fanfiction is only BillyxMandy if you want it to be.

A followup on "The Secret Snake Club." Irwin is released from jail and meets up with a certain macrame club member. A CarolxIrwin oneshot. Request fic.

In this story, Mandy decides to give a very special Halloween treat to someone who helped her on her first Halloween.

Only the journal entries can show the true killer. Billy, Irwin, Mindy, Nergal. . . . . Oh, who could it be if its even one of them.

After facing down the aSTRoVaMPiReS, Underfist learns of an all-new threat seeking to take over the world–and this new threat is led by Velma Green! Will Underfist be able to stop the Spider Queen? Will Fred Fredburger eat nachos and frozen yogurt? Will there be cobwebs everywhere? Find out the answers to these questions and more in Underfist: Return of the Spider Queen!

It's Valentine's Day and Mandy doesn't want to be a part of it. However, the day is going to get a whole lot more interesting when she gets hit by a particular bow and arrow. Billy x Mandy.

An extended ending to "The Greatest Love Story Ever Told." In which Nergal Jr. apologizes to a certain girl.

The long-awaited sequel to Underfist: Halloween Bash...is never coming out. Why? Because Cartoon Network didn't renew Maxwell Atoms's contract a decade ago. Instead, there's this: a fanfiction attempting to continue the story of Underfist. Join Irwin, Fred, Hoss, Jeff, and Skarr as they take on their biggest challenge yet: the aSTRoVaMPiReS!

Mandy's archenemy Mindy is at it again, and this time she makes a dare with Mandy like no other before. Now, Mandy has to find a boyfriend in a week before Mindy does, otherwise she'll have to be the read headed girl's slave. Little does Mandy know, what comes out of it is an experience that will change her life forever. BillyXMandy. T now for language, M later for lemons.

Billy and Mandy never liked each other but, they also never, didn't like each other.

The story of how Mandy learns how to smile without ending the world.

Chael and his childhood maiden friend, Belle, visit his father castle. Not long, friends from different dimension comes along as well, to visit the castle and them. [MultiCrossover]

One day, Billy and Mandy was fighting for Grim scythe when all of a suddenly, they were put under a curse. The curse cannot be undone, to what Grim had putted. The scythe been going crazy since Grim execution day. The day of that incident...

someone is depressed - future fic

Based off the fanfic 'Flapjack and His Random Adventure.' Billy, Mandy, and Grim have a great time on a wonderful weekend day. But things go crazy when they go doing random things. Rated T for swearing, nudity, and of course randomness.

A trip to the Underworld Forest leads to unexpected feelings. A GrimxVelma oneshot.

After Mandy is put on house arrest, Grim becomes a torch singer. A parody of "Mind Over Murder." Rated T for suggestiveness throughout and one bad word. Also for a middle finger. Sorry if you get offended.

Ever wonder what happened to Underfist after the movie? Read to find out! PS. Cartoon Network, please renew Maxwell Atoms's contract and make this a TV show!

So I died and now I'm a cartoon I have very little knowledge of. Add to that I'm a child and im being raised as the next heir to my father's legacy! What kind of weird situation am I in! Oh well ill just roll with it for now until I'm old enough to leave and live on my own, for ill interact with kids my age I guess. Hey, those two look decent enough! "HEY LETS BE FRIENDS!"

The road had been long, and in her early years the new Empress believed it wouldn't happen until she was well into the middle of her life, but that all changed the day of Mr. Sunggles tenth birthday. The day she met the Grim Reaper. An epilogue to the entire series. Warning: Character death. Surprise ending.

The summer of their 15th year, Billy is sent to military school, leaving Mandy alone in Endsville without her 2 'bestfriends'. Junior steps up to take their place, and Mandy's heart.

Mandy has a crush on someone. Can Grim help?

Las mismas estupideces de siempre, los mismos problemas, no había nada diferente, solo era un día más.