The year is 2027. Multinational biotech corporations specializing in human enhancement are vying for dominance in what has become a controversial field. Many engage in clandestine wars against each other, employing thieves, moles, and hackers to steal their competitors' ideas. To protect its research, Detroit-based Sarif Industries has recently developed its own internal security force. Enter Adam Jensen, newly appointed head of S.I. Security...
|image=File:Adam jensen die.png|240px
|location= Sarif Industries, Detroit
|name=Welcome to the Revolution
|next=Back in the Saddle
}}'''Welcome to the Revolution''' is the prologue of ''Deus Ex: Human Revolution''.
==Sarif Industries laboratory==
You start at Megan Reed|Megan Reed's office. There's some "point and click" to do. The important ones that are required to get the Old School Gamer achievement are:
*:File:Toy car megan gift.png|Toy car
*Book :File:Book megan office.png|Being More Effective
*:File:Photo Darrow Megan.png|Portrait of Megan and Darrow
*Picus TV|Picus newspaper
*AJ09-0921_Patient_X|Ebook containing Megan's notes on Patient X
File:Megan_Reeds'_office.png|thumb|262px|Megan Reeds' officeFile:Alarm sarif industries.png|thumb|262px|Tyrants|Tyrant attack begins. After you leave the office, you will automatically follow Megan through a couple of labs, and be introduced with the plot. At one point a cutscene will play, showing Adam Jensen|Adam and Megan going into the elevator. Francis Pritchard|Frank Pritchard will join them shortly after, and have an argument with Adam after Megan leaves the elevator.
==Speak to David Sarif==
Afterwards, you'll arrive at David Sarif|Sarif's penthouse, and enter his office. After few more moments of chatting, an alarm will sound. You will be sent via Sarif's personal elevator to check what is happening. The elevator code is 0451.
File:Mission1 1st enemies.png|thumb|266px|Two enemies will be coming down the stairs.Pritchard will tell you the approximate location of Dr. Reed, and that there's interference with the comm signal coming from somewhere. After that, the contact will be lost, and you'll exit the elevator on another floor of laboratories.
==Investigating the disturbance==
It's a pretty linear path, simply move through the corridors and open doors. At one point, you'll witness Lawrence Barrett killing two scientists. Turn to the left and remove crates by a vent, which you'll use to continue on. The first enemies you'll encounter will be in an empty lab with stairs leading up to the 2nd floor. Just take cover and aim for the head. Since the Combat rifle in the prologue is fully upgraded, they won't pose too much of a challenge.
Move up the stairs through the doors, and continue on to another small lab. Best tactic here is to take cover by the door, open it, take out the two enemies standing ahead, then finish off the last one in similar fashion. Once you've dealt with them, go out the opposite door.
A little later, you'll see Yelena Fedorova gun down three security guards, and a scientist afterwards. Move through the doors he managed to open with his dying breath, and take cover. Four enemies will come through the door below. Again, stay in cover and aim carefully, and you'll be fine. Cover and shoot-and-hide tactic is your best friend here.
Exit the lab and continue through the corridor. The end level cutscene will follow.
*'''Please note''', that killing any enemies here ''will'' prevent you from getting the Pacifist achievement.
*A helpful tip for passing enemies without killing them is to use objects in the environment. Poison gas does not kill enemies, but will kill Adam. Also remember that you do not have to kill everyone in the game.
This video shows you the integral parts of this mission, as well as how to get past the guards without killing anyone (pacifist approved!)
File:Mission1 cover by door.png|There's a yellow canister near those two that you can use to take both at once.
File:Adam jensen over shoulder.png|Last encounter with the enemies.
Category:Deus Ex: Human Revolution main missions