After defeating the final boss, the Icon of Sin , the game concludes with a final message:
The Marine learns that the survivors of Earth are trapped in a starbase, the only way to escape the planet. He must clear the way for the evacuation ships . Doom 2: Hell On Earth
Once the ships have safely launched, the Marine is the last human left on Earth. He discovers that the source of the invasion is a massive interdimensional portal located in his own hometown. After defeating the final boss, the Icon of
The game begins immediately after the events of the original Doom . Upon returning to Earth, the Marine finds the world overrun by demons : He discovers that the source of the invasion
"Back at last... You've returned home on well-earned leave. Your drop pod lands with a crunch. You open 'er up and look out. Damn! The city ahead is on fire... Hell, not again! You can feel it. It's all starting again, just like on Mars." Intermission Text Screens
Realizing that closing the portal from Earth's side isn't enough, the Marine steps through the gateway into Hell itself to destroy the invasion at its source. Ending Text: The Victory