| ||For other characters that appear in the Fallout universe named Billy, see Billy.|
Interactions with the player characterEdit
|This character is essential. Essential characters cannot be killed.|
|This character drops an ear when killed (Contract Killer).|
|This character drops a finger when killed (Lawbringer).|
|This character can be enslaved with the Mesmetron.|
|This character is a temporary party member.|
|This character is a permanent party member.|
|This character is a doctor.||
|This character is a merchant.||Caps: No|
|This character can repair items.||Repair cap: No|
|This character starts quests.||
Billy is encountered the first time you enter the Pitt steelyard. Should the player chose not to kill him on their first encounter, Billy is never seen again (unless on subsequent visits the player chooses to assume that one of the many generic trogs in the steelyard is Billy.)
His brother John-John can be seen talking to him, trying to tap any human reason still left in Billy. It is soon revealed that Billy, however, has lost all of his ability to reason, and soon the one-sided conversation deteriorates with John-John running to a locked gate screaming for help. At this point, Billy attacks John-John. John-John will not fight back, and should the player not intervene, Billy will kill him. He will then end his scripted events and, like any other trog, attack the player.
Should the player make a successful sneak attack on Billy, but fail to kill him, he may immediately attack and kill John-John before seeking out the player.
Should the player kill Billy and save his brother, John-John will walk over to Billy's corpse and cry. He offers no thanks or dialogue options; when conversation is attempted, he only pouts a pitiful "Billy..." and continues to sob.
Mentions of how trogs lose the mental capacity to reason, even with loved ones, are seen in Sandra's trog research entry on her research terminal.