Hell On Earth — Doom 2:

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

If you are looking to purchase a copy of the game or its related media: Doom 2: Hell On Earth

"The horrendous visage of the biggest demon you've ever seen crumbles before you... The invasion is over. Earth is saved. Hell is a wreck. You wonder where the bad folks will go when they die, now. Wiping the sweat from your forehead you begin the long trek back home. Rebuilding Earth ought to be a lot more fun than ruining it was." Product Information Realizing that closing the portal from Earth's side