You have multiple options for completing this quest, both good an evil. Zimmer wants you to find his android so that he can recover it. They can be found in the following locations, among others: The android has left holotapes throughout the wasteland that can start this quest. Zimmer himself, as he is the one looking for the android. The most obvious option to start the quest is through Dr. It's better to have access to Rivet City though. You can start this quest pretty early in the game if you know where to look.
Zimmer in Rivet City's Science Lab, or one of various holotapes spread around the Wasteland
The Replicated Man Fallout 3 Walkthrough (Side Quest) - Guide by Carl Click here to return to the Fallout 3 Walkthrough Index Quest Start: Dr.