Taavi Plays Doom 2 #4
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The player once again takes the role of the Doomguy, who, after being stranded on Phobos and subsequently fighting his way out of Deimos and Hell itself, returns home to Earth — only to find that it too has fallen victim to the hellish invasion.
With all the major cities in the world in ruins, the remaining leaders plan to use spacecraft to transport the survivors of Earth's population. However, the starport is the only way for the ships to depart and the demons have protected it with a force field. All of humanity's remaining soldiers make a desperate assault on the starport, but eventually they are decimated and only the player remains. He continues on doggedly and selflessly, despite knowing that he will be left behind in order to save the rest of his race.
Once the Marine accomplishes this, he is free to live out the rest of his time alone on Earth while humanity hopefully continues on elsewhere. But along the way, he begins to learn how he might finally thwart the invasion once and for all...
(extract from the Doom Wiki)