Final Doom – TNT: Evilution

Final Doom – TNT: Evilution is a game where a lone marine confronts a demonic invasion. The conflict originates from the UAC's continued research into dimensional gateways, this time on Jupiter's moon Io. Initial experiments were successful, with marine forces eliminating any hellish entities that emerged.

This containment ended when a hellish spacecraft, constructed from unnatural materials, arrived disguised as a supply ship. It deployed demonic forces that overran the base, killing or transforming the personnel. The protagonist, a marine commander who was absent during the initial attack, returns to find the base destroyed and vows revenge.

The marine's campaign involves battling through the invaded facility. The conclusion sees the defeat of a major entity called the Demon-Spitter, after which an ominous blue light glows within its remains, suggesting unresolved threats.