| ||For other characters named "Carter", see Carter.|
In May 2229, Mr. Carter entered Diamond City and joined others at a bar, claiming to be from the west. After three hours and four-five drinks, Mr. Carter suddenly lost his smile and his cheek began twitching. He then drew a revolver and calmly shot the barman, Henry, in the head. He continued shooting, killing another three to four people, before being killed by Diamond City security. Upon inspecting his corpse, the witnesses discovered the plastic and metal underneath, revealing that Mr. Carter was actually a new generation of synth.
This event, later known as the "Broken Mask Incident", led to the people of The Commonwealth learning of the existence of third generation synths, synths completely identical to humans. Later, in 2287, journalist Piper Wright would write an article on the event, The Synthetic Truth.
- A holotape located in the Institute suggests that an unknown synth was released for field testing prematurely and that something terrible happened to it. If that synth actually was Mr. Carter then that would mean that the Institute never meant to for him to be released.
Mr. Carter is only mentioned in Fallout 4.