Mandy had plans of conquering the world, but one day Billy moved away and everything changed. Stopped. Live kept moving forward and nothing was ever quite the same. Years later, Billy moves back and misadventures ensued.

A flapper is being reaped by the grim reaper

when Santa turns into a vampire Billy and Mandy team up with angry Luigi and alem tuber to find the main vampire

Gender Flipped, Dumb Luck AU! What if Mandy was the one who was cursed with bad luck?

An alternate universe fanfic where Billy never met Mandy or the Grim Reaper.

What starts out as just another regular day in Endsville turns into one of adventure for Grim, Billy and Mandy when they find themselves in the middle of another multiversal takeover plot led by Aku and Vilgax! Just like before, the two-headed robot is looking for heroes, but Grim, Billy and Mandy decide to test the robot's worthiness in the best way they know how.

when Billy fights with Jeff he now has a choice go home or save his friends based on wrath of the spider queen

Mindy's mom hired a tutor to help her daughter study well.

Much to their strong dismay, LJ and Zofia have to go to the Underworld with Billy, Mandy, and Grim when the death reaping skeleton is sentenced to court for misusing his powers and the Boogeyman takes him to court. When Grim's powers are soon taken from them, they are told about Horror's Hand which can make one's fears come alive and Boogeyman intends on taking it for himself.

Billy and Mandy realize they have old versions of themselves from 1998 and go to visit them. Grim realizes that he's better off with the normal Billy and Mandy.

When Junior first came to the surface world, he stole the appearance of a young boy at winter camp. In doing so, he unknowingly tore that boy's family apart. OC centric

Mandy meets a goth girl named Mariella after getting wide hips.

Billy's life was at peace since he left Endsville few years ago. But an old friend returns and soon his peace would shatter as he brought a devastating news. Mandy was taken to hell by the Devil. with his Scythe and guidance from Grimm. they raced against time to save Mandy. based on the timeless story 'Inferno' by Dante Alighieri reimagined into the world of Billy and Mandy

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!

Billy and Mandy are in High School now. While some parts of there relationship has changed, the Fundamentals are still the same. BillyxMandy, one shot.

Eris the goddess of chaos decided to add a little romance to the mix of her chaotic shenanigans, seeking to bang the sexiest females in Endsville. WARNING: CONTAINS FUTA ON FEMALE ACTION

LJ, Zofia, and their friends come to celebrate Halloween with Billy and Mandy. However, not all is well when Grim tells them the story about a prankster known as Jack O. Lantern who lived in ancient times, causing tricks for people. Due to Billy's stupidity, he comes back and takes Grim's scythe to make it Halloween night forever so he can conquer the world.

As they settle into married life, Nergal decides to reveal to Sis the story of how he grew up and how he came to be banished from the Underworld. In the meantime, the powers that be threaten their future ... a future Sis is keeping a secret for now.

A three part love story about Billy and Mandy, where Mandy's parents are out of town for a month. And she stays with Billy and his family; and the two find out they have a lot more in common than they thought and that they've had secret feelings about each other for years. Set 7 years after the final season characters are 16 to 17 hope you enjoy please review M for sex.

Billy goes to a bar and starts singing karaoke./Billy goes out to the lake to go fishing.

They've faced down an evil marshmallow bunny, squid attackers from the underworld, aSTRoVaMPiReS, and spiders. They've grown close...er. They're accepted as Earth's heroes...kind of. But now, Underfist faces its greatest challenge yet...the judicial system!

Mandy finds out that she has a voice of a angel.

Mandy was screaming upstairs, so Grim sent Billy to check what was happening to her. What Billy saw would change him forever, and it would all according to Grim's master plan. What happened to Mandy? What did Billy see? What was Grim's master plan? Find out by reading this amazing story about the loss of friendship and the start of something new.

After an injury to his head Billy starts to question his life and those around him. He starts to wonder if he can really be happy again now that he is ironically now just not stupid enough to realize how little it all seems to mean to him now. Mandy, on the other hand isn't going to settle for it and Eris has plans of her own.

Grim found out that Mandy is dancing.