Deus Ex mod mission called Mutations.
Interesting idea - turning game into... dungeon crawler. Yes, that's it. This include collecting keys, backtracking, maps etc. So you start in upper dungeon, placed on lower dungeon and laboratory complex under it all.
I know, DesuEx is terrible in combat, shooting etc. but still - pretty neat idea. Similiar to Biomod - you got XPs almost constantly.
I like the dialogs, they're different from vanillia and other mods, Mutations not taking itself seriously. I like it, after earlier mods that tried hard telling serious stone (despite whole conspiracies theme feelings of '90 tvseries like Xfiles), that catch me in vanillia Deus Ex) it's quite refreshing to see something like that.
Story - after what happened in original Deus Ex JCD got retired, Gary Savage become a head of Unatco (which turned from corrupted puppet for Fema into proper antiterror organisation).
Illuminati and MJ12 are fine despite our eforts.
And here what happened - decade ago strange object crashed into Earth (based on stolen videotape), with some strange substance, Mj12 eggheads call it Phiatoselem.
It booster significantly progress of research on supersoldier project and virus, similiar to Gray Death from vanillia.
Then Gary tell you that Greys (aliens) make contact with Unatco few days ago, asked for this substance back, waiting for us behind the Moon where they hide their ship. Neat.
Some screens
fake edit
gee, text info is bigger than screens collection.