Just drafting up a storyline based on the old 2000-2001 half-life 2 one.
Half-Life 2: Dark Matter
Chapter 1: Fish Town (Not Final)
Mood: Dark, Stormy, Cold
Part 1
Gordon wakes up on a Black Mesa tram, starting his day, mirroring Half-Life's first moments. After the first turn, everything but the bottom of the tram is stripped as the G-Man begins his speech. It is revealed that a unknown, at the time, force has invaded and taken over all of Earth. The scene fastplays as the citadel spire is thrust into the middle of the city, and transforms slightly. As soon as this is over, you are dismissed from stasis and wake-up in a cot.
Part 2
Gordon gets up out of bed, and looks around the place. He hears voices, so he looks out the window, and sees several soldier-like people. Among them, he sees a weird tall creature with a gun of some sort. It is shown spewing out acid onto several dead headcrabs. They disapper from view, and Gordon decides to find a way off the ship. He dodges several soldiers until he comes upon a compartment. In it, are many citizens on their way to City 17. One of them, Samuel, comments that Gordon needs to blend in more, so he gives gordon some clothes (No, Gordon was not nude) and a gasmask, for when they reach the docks. 3 hours pass before the ship finally docks. Gordon, along with other citizens, and inspected to make sure they have the right ids. Gordon's doesn't check out, so the cop takes him to a cell. Along the way, Gordon is able to see the spire, and the ship's name, the Borealis. He is thrown into the cell, where the cop reveals himself to Gordon; Barney Calhoun. Barney gives him a quick run down of events, before sending Gordon off to Dr. Kliener's lab.
Part 3
Gordon exits the cell through some vents and an underground tunnel, before coming upon a bus depot. Samuel see and recognizes him, and motions to him to come with him on the bus. The bus drives through several parts of town, giving Gordon a big view of the city. The bus eventually stops at a bus stop, near some tenements. Gordon, as well as Samuel and a view other citizens, enter the apartments, and settle for a moment. Samuel, knowing Gordon's true identity, gives him the directions to Kliener's place, before a bunch of police raid the place, forcing Gordon to flee into the industrial area.