GuessAnime.

1. Kiseijuu: Sei no Kakuritsu

All of a sudden, they arrived: parasitic aliens that descended upon Earth and quickly infiltrated humanity by burrowing into the brains of vulnerable targets. These insatiable beings acquire full control of their host and are able to morph into a variety of forms in order to feed on unsuspecting prey.

Sixteen-year-old high school student Shinichi Izumi falls victim to one of these parasites, but it fails to take over his brain, ending up in his right hand instead. Unable to relocate, the parasite, now named Migi, has no choice but to rely on Shinichi in order to stay alive. Thus, the pair is forced into an uneasy coexistence and must defend themselves from hostile parasites that hope to eradicate this new threat to their species.

Parasyte -the maxim- is finished and has 24 Episodes. It is also Known as: 寄生獣 セイの格率, Parasite, Parasitic Beasts, Parasyte

2. Black Bullet

In the year 2021, a parasitic virus known as "Gastrea" infects humans and turns them into monsters. What is left of mankind now lives within the Monolith walls, walls that are made of Varanium, the only material that can hurt Gastrea.

To counter the threat that the Gastrea pose, "Cursed Children"—female children whose bodies contain trace amounts of the virus which grant them superhuman abilities—officially called Initiators by the Tendo Civil Security, are given partners called Promoters, people who work to guide and protect the young Initiators. These teams of two are sent out on missions to fight the monsters created by the Gastrea virus and keep them at bay. Black Bullet revolves around the team of Enju Aihara, an Initiator, and Satomi Rentaro, a Promoter, as they go on missions to fight the growing threat of Gastrea in their hometown of Tokyo.

Black Bullet is finished and has 13 Episodes. It is also Known as: ブラック・ブレット　BLACK BULLET　［黒の銃弾］, Black Bullet

3. Alien 9

Yuri Ootani, a girl who has been afraid of aliens, has been chosen to be on the alien party with the class president Kumi Kawamura, whose only intention to join the alien party is to get out of presidential duties, as well as Kasumi Tomine who is perfect at everything she does, including fighting all the aliens that come in their way. But can they defeat a massive alien who has already abducted Kasumi?

Alien 9 is finished and has 4 Episodes. It is also Known as: エイリアン9, Alien Nine

4. Chrome Shelled Regios

In a post-apocalyptic world overrun with mutated beasts called Limbeekoon or Filth Monsters, humanity is forced to live in large mobile cities called Regios and learn to use special weapons called Dite, by harnessing the power of Kei to defend themselves. In the Academy City of Zuellni, Layfon Alseif is hoping to start a new life and forget his past. However, his past has caught the attention of Karian Loss, the manipulative Student Council President and Nina Antalk, a Military Arts student and Captain of the 17th Military Arts Platoon, who instantly recognizes his abilities and decides he’s the perfect candidate to join her group. However, with a secret past that won’t leave him alone and unknown powers beyond normal, Layfon just might not take it.

Chrome Shelled Regios is finished and has 24 Episodes. It is also Known as: 鋼殻のレギオス, Koukaku no Regios, Kokaku no Regios

5. Ayakashi

As a child, Yuu Kusaka made a vow upon a shooting star that he would stand on the side of justice and defend the weak. However, the death of one of his friends robs him of the desire to live up to that vow, and he turns a blind eye to the misery of others, using the mysterious power he possesses as a means of making money instead of helping those in need. His days of living only for himself continue, until he's forced to fight for his life against another classmate with powers similar to his. He's saved by a mysterious girl named Eimu Yoake, who also has strange powers.

Eimu reveals that his powers stem from a creature known as an Ayakashi, a parasitic being that grants the user special abilities at the price of slowly draining the life of the host. She helps him fully awaken his own. Now aware of the ayakashi he possesses, Yuu must live up to his childhood vow, putting his ayakashi to use and fend off those who would use their own for evil, all while unraveling the mystery behind the death of his friend.

Ayakashi is finished and has 12 Episodes. It is also Known as: アヤカシ, Ayakashi

6. Baoh Raihousha

A secret organization called "Doress" has funded the development of a genetically engineered parasite code-named "BAOH." Organisms infected by BAOH become living survival machines, virtually indestructible, able to mutate their body structure to meet any threat. Properly controlled, the BAOH parasite could allow Doress to control the World.

Unfortunately, their first human guinea-pig, a young man named Hashizawa Ikuroo, has managed to escape, along with a young girl, Sumire, who has a strange precognitive gift. Unless Doress operatives can find and destroy Ikuroo before the BAOH parasite fully manifests, their evil dream will come to naught.

But BAOH, comfortably hiding in Ikuroo's brain, won't make it easy.

Baoh the Visitor is finished and has 1 Episodes. It is also Known as: バオー来訪者, Baoh, Baoh Caller

7. King of Braves GaoGaiGar

In the year 2005, a race of alien monsters called Zonders emerge from underground and launch a series of attacks on the city of Tokyo. The only defense against these creatures is the secret agency known as the Gutsy Geoid Guard and their ultimate weapon, the awesome giant robot GaoGaiGar. GaoGaiGar's pilot, Guy Shishio, is a former astronaut who was nearly killed two years before when the Zonders first crashed to earth. Guy's life was spared when a mysterious robot lion called Galeon pulled him from the burning shuttle and brought him to Earth. Guy's father, Leo, then used Galeon's technology to rebuild his shattered son as a cyborg, in the hopes that he could stop the aliens when they appear. Now, with Galeon as its core, GaoGaiGar fights to protect Earth. He is aided by a team of transforming robots and by a young boy named Mamoru, who has the power to purify the Zonders' cores, and seems to be connected to the mysterious Galeon.

King of Braves GaoGaiGar is finished and has 49 Episodes. It is also Known as: Yuusha-Ou GaoGaiGar, 勇者王ガオガイガー, GaoGaiGar, GaoGaiGar TV, Yuusha Ou GaoGaiGar, Brave King GaoGaiGar, Yuusha-Oh GaoGaiGar

8. Kyoushoku Soukou Guyver (2005)

Sho Fukamachi, a normal teenager accidentally found an alien object called Unit and thus, changed his life forever. The Unit bonded with Sho, resulting in an incredibly powerful life-form called Guyver. With this great power, Sho battles the mysterious Chronos organization and it's Zoanoids, in order to protect his friends and his world. Unknown to Sho, the battle against Chronos will lead to the discovery of the origins of human, their destiny, and the Creators...

Kyoushoku Soukou Guyver (2005) is finished and has 26 Episodes. It is also Known as: 強殖装甲ガイバー, Guyver: The Bio-boosted Armor

9. Iria: Zeiram The Animation

Iria is the story of a girl and the Alien being she loves to hate. The series begins with her brother, Gren, taking a job. He is a bounty hunter, and one well known for his incredible skill. Iria, being a skilled apprentice bounty hunter herself, tags along. What is the job, one might ask. It is to find out what has happened to the crew and cargo of a Space Station. Needless to say, nothing is as it seems, and the war between Iria and Zeiram begins in earnest.

Iria: Zeiram The Animation is finished and has 6 Episodes. It is also Known as: イ・リ・ア ゼイラム The Animation, Iria: Zeiram The Animation

10. Shin Mazinger Shougeki! Z-hen

Set in the near future, humanity enters another energy revolution following the discovery of Photon Power. Derived from the ore discovered under the foothills of Mt. Fuji, its intended use was to solve the world's energy problems with its unimaginable power. Seeking this energy is Dr. Hell, a madman craving world domination who with his subordinates Baron Ashura, Count Brocken and Viscount Pygman, commands an army of mechanical beasts excavated from the ruins of ancient Greece to seize the Photon Power Lab for himself. Meeting the attack head on is the hot-blooded teenager Kabuto Kouji, who pilots the Photon Powered robot built by his grandfather, Mazinger Z. But in this battle between Dr. Hell and the Kabuto family, many legends surrounding the Mycenaean Civilization and Bardos Island, as well as the secrets of Mazinger Z remain shrouded in mystery.

A new series based on the mecha show that started it all, Mazinger Z. Shin Mazinger Shougeki! Z-Hen starts over from the beginning with a new cast, to tell a new story unrelated to the original show.

Mazinger Edition Z: The Impact! is finished and has 26 Episodes. It is also Known as: Ｚマジンガー; 真マジンガー 衝撃！Z編, Shin Mazinger Shogeki! Z-hen, True Mazinger, Z Mazinger

11. Gyo

Something in Okinawa reeks, and it isn't long before Kaori and her friends realize that the smell is coming from dead fish, which are walking out of the sea. The fish are fused to metal legs and are infected with a disease contractable by humans that was invented as a weapon by unknown sources. After what happens to Tadashi, Kaori finds herself in a new world very much like the old one but with the stench of death.

GYO: Tokyo Fish Attack! is finished and has 1 Episodes. It is also Known as: ギョ, Gyo

12. Xenosaga The Animation

The year is T.C. 4767. Four thousand years have passed since humanity abandoned its birthplace, the planet Earth. Beset by the hostile alien Gnosis, mankind is now scrambling to find ways to defeat this threat to their existence. The development of KOS-MOS by Vector engineer Shion Uzuki was one response to the threat. But when their ship is destroyed by the Gnosis, Shion and her companions find themselves thrust into the middle of a battle with no clear sides...

Xenosaga The Animation is finished and has 12 Episodes. It is also Known as: ゼノサーガ THE ANIMATION, Xenosaga The Animation

13. Kurau Phantom Memory

It is the year 2100, and on the colonized Moon, a project is under way to explore new aspects of energy. Amami Kurau is the daughter of the chief scientist on the project, and on her 12th birthday, she accompanies her father to the lab to observe the experiments. Then something goes awry, and Kurau is struck by twin bolts of light. In the aftermath, her father is dismayed to find that his daughter is no longer his daughter. Rather, her body is now home to two energy entities with fantastic powers.

Kurau Phantom Memory is finished and has 24 Episodes. It is also Known as: クラウ ファントムメモリー, Kurau Phantom Memory

14. I: Wish You Were Here

In the future, a meteor crashes into Earth and brings with it a virulent form of life. This virus is known as M34 and attacks humans, turning them into vicious monsters. Most of the human population is wiped out, thus government agencies are formed to fight the virus. One of the groups, NOA, inserts nanomachines into the bodies of its soldiers; these machines allow them to transform and fight off the infected. Unfortunately, the virus mutates and becomes too strong for NOA to handle. Now the fate of the world rests in the hands of 16-year-old girl with the power to defeat the virus.

Zaion: I Wish You Were Here is finished and has 4 Episodes. It is also Known as: i -wish you were here- ～あなたがここにいてほしい～, Anata ga Koko ni Itehoshii

15. Nobunagun

Shio Ogura is a Japanese high school student, who is visiting Taiwan on a school trip when she is suddenly attacked by monsters. Agents known as "E-Gene Holders" from the government agency DOGOO also arrive, who wield weapons infused with the spirits of historical figures. Shio is revealed to also be an E-Gene Holder when the soul of Oda Nobunaga awakens after she tries to rescue a friend.

Nobunagun is finished and has 13 Episodes. It is also Known as: ノブナガン, Nobunagan

16. Lily C.A.T.

2264 A.D.: The Starship Saldes is sent into deep space to explore a newly discovered planet. The journey will take twenty years. The Saldes' crew of thirteen, mixing experienced space jockeys with eager but naive scientists, are prepared for anything -- except an unseen alien invader with an insatiable appetite. Along with the ominous force that takes over the ship's controls. The voyage becomes a grim struggle for survival in a vessel that has become a coffin orbiting the paradise world which was to be its destination.

Lily C.A.T. is a Movie. It is also Known as: LILY-C.A.T., Lily Cat

17. Dead Space: Downfall

Prequel Movie to the game Dead Space

Dead Space: Downfall is a Movie.