Tron + Portal + Doom

I couldn't even begin to describe the awesomeness of this dream, but I needed to try and get this part down. Backstory... my team and I were fighting through these futuristic corridors against ever increasingly impressive robots. Starting off with large, chunky Dalek like ones and turrets, building up to Cyborgs.

...
In a lull in the battle, I finally get a moment to check out my gun. I ask the guy who gave it to me. A guy I referred to as Rinzler (from Tron) because that's what he looked like. I had the settings of my gun figured out, but there was a switch that said "Fast 3." He explained it to me, and then another guy on my team asked to see it. "Yeah, sure!" He immediately pulls the power cell out of it, and sticks it in his mouth with an extreme sucking force. I realize he's one of them. I snatch the cell out of his mouth, but he fights with me. We wrestle. Holding each others arms, fighting for control. I get the cell back into my gun, and begin firing at him, point blank. Red blasts erupt from my gun into his legs. Then another teammate gets into the fight, and presses the attacker into the wall. We both pin him against the wall and restrain him. My teammate also begins shooting into his torso. Explosions of pink blow out of his chest. Holes begin to form. It becomes clear that he was a synthetic robot. While a gaping chasm forms in his chest, he doesn't die. Along the edges of of the damaged area, a pink grid begins to show. Eventually, from both of us unloading out weapons on it, it is split in half, and collapses in ashes on the floor.

I announce, "Be mindful, people!! They look like us now!!"

With a sniff of the air, I turn to my teammate. "Oh god... you smell that? It's awful. Is that... vomit?"

Yeah, the remains of this synthetic being smelled of vomit and it was on us both.

Then it wasn't and we were on to the next level.
Dreams are weird places.