Apparently, running into Xenomorphs wasn't bad enough. The things had to be bulletproof and coordinated by an extradimensional reality-warping entity. Thankfully, my Marines and I would gain an unexpected ally: a mysterious kid with some serious skills.

After the war with Gaia all was well. For 4 years Percy had a wonderful life. But when his brother came to camp and everything changed.

Danny was forced to move to New York. Sadly, the ghosts have followed. However, he has met this new kid named Gregor who brings him into new trouble. Down in the Underland the rats have decided they didn't want peace anymore and war has broken out! What will Gregor and Danny do?

Two years after the events of the Underland Chronicles, and one year after Blood of Olympus, Gregor and his family are enjoying a peaceful life far from the troubles of New York City. That is, until strange, fiendish creatures begin to appear more and more frequently, that Gregor is certain should not exist. What will he do now, as the Warrior is forcibly resurrected once more..?

A reluctant MI6 agent called Alex Rider is mentioned in a prophecy. But the twist is the prophecy comes from a land down far below New York - The Underland. In the underland Alex Meets Gregor and his family, they then go on to fight many battles. Romance, Advenure, Horror, Sci-Fi, Tragedy

The continued story of Dani and her beloved after she has been miraculously rescued and are now in search of Niall, who has been captured.

Artemis and Holly go on an amazing adventure to New York to save Domovoi Butler, but end up in a different kind of land. Artemis and Holly have to be helped by the Underlanders. Luxa's little sister and a knight of great proportions. They are joined by a brother and sister who have lived in New York their whole lives.

its a cross over for well attack on titan and underland chronicles but its an au for attack on titan mainly because well some characters from attack on titan but there in the modern world and this is the first time titans attack horrible summary

Star wars meets TUC. Zachary Thomas Byford is a young Jedi padawan that while on a diplomatic mission, the Consular-class cruiser Fury has a hyperdrive malfunction over the planet Earth in the Sol system, and gets caught in Earth's gravity well which causes the ship to enter the atmosphere over the crumbling ruins of New York City. Two-years after TUC. 40 ABY. R&R

The heroes of Olympus are ready for their next quest. Next stop, Underland...

When TMI falls through the gate in Gregors apartment complex they find way more than they bargained for. Old enemies from the overland and underland bring forth a new threat. Can the two groups work together to save both the overland and underland.

Percy and Annabeth end up in the Underland after being forced to take Gregor and Lizzie to the movies. Post TLO, CoC. Complete!

What really happened to the Valyrians? -CRACK-

On a strange world, a boy by the name of Kevin has just started his winter break, but when he begins to be plagued by nightmares of dark creatures killing his friends, and strange things begin to happen on his world, will the worlds be conquered by this unseen evil, or will he, and his friends, be swallowed by the darkness?

What if Voldemort survived, and fell into the underland? What if Harry found out, and went after him? Ever wonder what happened to Stan Shunpike? Harry and co. go to the underland, discover giant owls, and meet Gregor. But will they be able to defeat Voldy before it's too late? Another prophecy has arrived, foretelling a quest, and the dead rising... ON HIATUS. Sorry! :(

*title subject to change*After a battle with a ghost, Danny gets sent to the Underland with a certain teenage rager, how will things play out here? k plus for violence

After saving the world, Victoria and the rest of the crew of the argo two find an opening to another land, one where rules of the overland don't apply...

Another freaking prophecy?" She just nodded, "Why is it that the fate of this place is always in danger?" The other boy laughed, "Don't ask me! I was dragged into this place!" "Yeah, well I fell," She shook her head at the rudeness, offended by their immature talk.

Percy and his friends discover a land unknown to the gods. Gregor's will to return to the Underland is tested by it's new threat. Post COC, Post TLO but Pre TLH Rated T because of possible death and the general darkness at times.

One shot: This is what happens when Sonic gets lost. Rated T just in case.

Drabble crackfic about Haymitch meeting Ripred and kinda telling each other about themselves. Doesn't really make sense. Don't have to read it, but views and reviews would be greatly appreciated. Oneshot, though may continue. Thanks!

Due to the family 's limited financial situation and Grace's desire to get out of New York, they move to Great Britain to Grace's sister's home. When there, Gregor finds out some things about himself.

there is a new camper at camp halfblood and percy gets very confused around her. meanwhile in the underland the wars have come back but with a new enemy.

Younger brother of mike from the previous story has gone missing after the assult on MT.OLYMPUS. John sets out to start looking for him going through a portal to hell, Insdead he ends up at camp Rome. Next thing he knows he's in a darkroom,*Cling*he hears

This is a story of a child of athena who,along with other demigods gets sucked into the underworld...not hades palce...but the underworld in the underland chronicals books: hades mightttt be down there though: nott complete...just...on hold..