The Replicated Man

 is a Fallout 3 quest. It is also an Xbox 360 and PC achievement.

Objectives and walkthrough
The quest is given to you in Rivet City by Dr. Zimmer, who asks you to track down an android that has escaped. The android has gone sentient and independent and does not wish to return.

This quest can also be started in Big Town, by picking up a holodisk in Red's Clinic, in Paradise Falls by picking up a holodisk in Eulogy's Pad, or in Megaton, by picking up a holodisk in Craterside Supply. The player can then talk to various people in Megaton (like the doc or Moira) to get more information about the android.

This quest can also be given by finding a tape recording in Tenpenny Tower

Solution 1: Talk to Pinkerton in Rivet City.

To reach Pinkerton, go to the deck of the aircraft carrier. Walk all the way to the far end of the carrier where the aft section has broken away from the rest of the ship. Save your game! Then jump into the water below and swim towards the broken section under the water. You should find an unlocked door underwater that you can use to gain entrance. The only other option is to pick the very hard lock on the main door located at the end of the bridge leading to the broken section of the carrier. When inside the ship, quickly kill the mirelurk's and be very careful as there are many traps.

When you speak to Pinkerton he will tell you that the android's name is Harkness, he is from the Commonwealth and has undergone facial reconstructive surgery and memory modification at the hands of Pinkerton. Harkness now works as the security officer in Rivet City. The player has the option to give Harkness his freedom as an android, leave him in his illusion that he's human or inform Dr. Zimmer.

Note: It is possible to recieve a A3-21's Plasma Rifle from Harkness if you prove to him that he is an android by using the code given to you by Pinkerton

Solution 2: Talk to Victoria Watts, often found in the Marketplace, in Rivet City, and she will give you a part from the android. If you hand this part in to Dr. Zimmer and tell him the android is dead you will complete the quest.

Miscellaneous Info: If you learn about the quest in Megaton, there's a chance you will be approached by a member of The Railroad on your way to Rivet City asking you to "let it go."

LESSON LEARNED: You may complete this in a "good" way and still not get Harkness's upgraded Plasma Rifle. I received this quest from the holodisk in Big Town. I followed up on it with Moira in Megaton, and then again with the doctor in Megaton, when I was then approached by the member of the Railroad. I agreed to help keep the androids secret, headed to Rivet City, found Dr. Zimmer in the Science Lab, and gave him the part. I then found Victoria Watts in the gantry above the Marketplace who told me about Pinkerton. When I found Pinkerton, he agreed to give me a free face lift, but did not offer up any code for Harkness that I could use to get him to give me his Plasma Rifle. I'm not sure if this would work, but I recommend seeing Pinkerton BEFORE talking to Dr. Zimmer and giving him the part.

NOTE: I also gave the part away BEFORE talking to Pinkerton. After finding the holotape in Sister's room I was given the chat option with Pinkerton, most likely due to the fact that the tape in Sister's room mentions him by name. Sadly, this won't let you get the weapon. The only option presented with Harkness, is that you set Zimmer straight.

Opening the console with ~ and typing "player.additem 0006B539 1" will award the weapon.