It's funny how much attention Nibiru gets. Sometimes it makes me wonder if it is debunking or disinformation.
The Nibiru story along with the Annunaki/Nephillim are mentioned in all ancient texts and books including the almighty

Bible! Different names and
a sligtly different story but all in all the same!
Here is a post that I found on this fellas myspace that is very interesting and it lists all the timelines.
Events Before the Deluge
450,000 years ago,
On Nibiru, a distant member of our solar system, life faces slow extinction as the planet's atmosphere erodes. Deposed by Anu, the ruler Alalu
escapes in a spaceship and finds refuge on Earth. He discovers that Earth has gold that can be used to protect Nibiru's atmosphere.
445,000
Led by Enki, a son of Anu, the Anunnaki land on Earth, establish Eridu -Earth Station I - for extracting gold from the waters of the Persian Gulf.
430,000
Earth's climate mellows. More Anunnaki arrive on Earth, among them Enki's half-sister Ninhursag, Chief Medical Officer.
416,000
As gold production falters, Anu arrives on Earth with Enlil, the heir apparent. It is decided to obtain the vital gold by mining it in southern
Africa. Drawing lots, Enlil wins command of Earth Mission; Enki is relegated to Africa. On departing Earth, Anu is challenged by Alalu's grandson.
400,000
Seven functional settlements in southern Mesopotamia include a Spaceport (Sippar), Mission Control Center (Nippur), a metallurgical center
(Shuruppak). The ores arrive by ships from Africa; the refined metal is sent aloft to orbiters manned by Igigi, then transferred to spaceships
arriving periodically from Nibiru.
380,000
Gaining the support of the Igigi, Alalu's grandson attempts to seize mastery over Earth. The Enlilites win the War of the Olden Gods.
300,000
The Anunnaki toiling in the gold mines mutiny. Enki and Ninhursag create Primitive Workers through genetic manipulation of Ape woman; they take over
the manual chores of the Anunnaki. Enlil raids the mines, brings the Primitive Workers to the Edin in Mesopotamia. Given the ability to procreate,
Homo Sapiens begins to multiply.
200,000
Life on Earth regresses during a new glacial period.
100,000
Climate warms again. The Anunnaki (the biblical Nefilim), to Enlil's growing annoyance marry the daughters of Man.
75,000
The "accursation of Earth" - a new Ice Age-begins. Regressive types of Man roam the Earth . Cro-Magnon man survives.
49,000
Enki and Ninhursag elevate humans of Anunnaki parentage to rule in Shuruppak. Enlil, enraged. plots Mankind's demise.
13,000
Realizing that the passage of Nibiru in Earth's proximity will trigger an immense tidal wave, Enlil makes the Anunnaki swear to keep the impending
calamity a secret from Mankind.
Events After the Deluge
11,000 B.C.
Enki breaks the oath, instructs Ziusudra/Noah to build a submersible ship. The Deluge sweeps over the Earth; the Anunnaki witness the total
destruction from their orbiting spacecraft.
Enlil agrees to grant the remnants of Mankind implements and seeds; agriculture begins in the highlands. Enki domesticates animals.
10,500 B.C.
The descendants of Noah are allotted three regions. Ninurta, Enlil's foremost son, dams the mountains and drains the rivers to make Mesopotamia
habitable; Enki reclaims the Nile valley. The Sinai peninsula is retained by the Anunnaki for a post-Diluvial spaceport; a control center is
established on Mount Moriah (the future Jerusalem).
9,780 B.C.
Ra/Marduk, Enki's firstborn son, divides dominion over Egypt between Osiris and Seth.
9,330 B.C.
Seth seizes and dismembers Osiris, assumes sole rule over the Nile Valley.
8,970 B.C.
Horus avenges his father Osiris by launching the First Pyramid War. Seth escapes to Asia, seizes the Sinai peninsula and Canaan.