Let's Play The Complete Classic Doom Collection - Part 196 - Brink (End of Legacy of Rust)(Final)
We encounter the final new enemy in this campaign, The Tyrant, which is a slightly weaker Cyberdemon with green wiring in its stomach instead of red. It's become apparent that there's no saving this place so the UAC left behind a failsafe for Doomguy to activate should push come to shove and shove come to the edge. Doomguy overloads some nuclear reactors and preps some nukes to self-destruct the entire base. He goes through the portal back to Earth, presses The Button, and everything he left behind blows up causing the portal to poof away. As he goes off to give the UAC a piece of his mind and his fist, something eats away at him, a feeling of uncertainty that somewhere more demon trouble is happening in a place long forgotten yet familiar.