DOOM 2 (DOS Player) allows you to play original DOS game on Android.

In this sequel to the original DOOM the protagonist is still the same hero - the last remaining space marine. After having single-handedly saved Mars from demonic threat he returns to Earth only to find out that the demons have already invaded it killed most of its inhabitants or possessed them. It's his task to bring down the force field around the last operational star port to allow the remnants of mankind to escape to the stars.