When two worlds with predefined mindsets, knowledge, and ideals have to throw all of that out the window after contacting a new player. Humanity. (Babylon 5/Mass Effect AU crossover with a Star Trek-based Humanity and Stargate-based Precursors)

The Galaxy is now at open war, and Babylon Five is the command centre for the Council races. Commander Vega leads a team in the final assault on HYDRA, while the fleets of the allied species move to counter the shadows and the vorlons. That leaves one last, vital mission for the Warsworn and their leader, the Grey Warden, once known as Commander Shepard.

A year after the drakh assault on Babylon 5, turmoil is beginning to spread. Three Spectres take on three missions to find the source. Quarian Spectre Lorn'Reegar challenges the terrorist Night Watch. Captain Draal, the first minbari Spectre, seeks the masterminds behind the ambiguous Unity Movement. Commander Ivanova and the Warsworn must search for the legendary planet Z'ha'doum

It is a New Age for the Galaxy, seventy years after the Reaper War. Veteran Spectre Commander Vega is sent to the Terminus Systems to investigator the loss of several ships. But the arrival of new races and sinister strangers on the Councils new space station present a different threat. The year is 2258, the name of the place is Babylon 5.

It is a new age for the galaxy, an age of change, which leads to both pain and joy .

The galaxy is vast, ancient, and dangerous. The younger races do not realize just how true this is. They are unaware of the giants that walk among the stars and the monsters that wait in the endless dark. But they will learn... or they will fall. For the next Age is coming.

Moments away from deciding the fate of the galaxy, a strange hairy alien grabs Commander Shepard and takes her to a different station - Babylon 4. Rescued from there by the White Star, now Shepard and the Normandy find themselves in a new universe, where their people and their technology are unheard of, and a different threat looms over the galaxy.

Mass Effect/Babylon 5 Fusion. When Earth discovered the Prothean cache on Mars it began a sequence of events that will change humanities destiny and the fate of the galaxy forever.