After defeating the final boss, the Icon of Sin , the game concludes with a final message:
Text screens appear between levels to transition the story across its three main acts: Doom 2: Hell On Earth
The game begins immediately after the events of the original Doom . Upon returning to Earth, the Marine finds the world overrun by demons : After defeating the final boss, the Icon of
"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 Your drop pod lands with a crunch
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.