Peter's origin. It is later discovered that Sam Weiss and his antecedents seem to possess knowledge about the First People and the operation of the doomsday machine. The author of the English language First People book is shown to have been one "Seamus Wiles", published in the 1800s. He also has other branches of mysterious knowledge, such as being able to predict that a series of seemingly random letters Olivia picks out will contain a message that would help her get over the death of Charlie. In the episode "The Last Sam Weiss", Sam explains that the name "Sam Weiss" has been handed down from several of his previous ancestors, the earliest having had found the bulk of the evidence on the First People, and that his line has been searching for more ever since. He is not mentioned after the episode "The Last Sam Weiss" until the ninth episode of the final season, when Olivia and Peter discover his body in a van, deducing that in this timeline, he died after the invasion protecting a signal tower, killing two observers and a loyalist in the process. Elizabeth Bishop Elizabeth Bishop (portrayed by Orla Brady) is Walter's wife in both universes. After Walter took the alternate Peter from the other universe, Elizabeth stayed at home with him, trying to convince Peter that she was his real mother. After running away from home, Peter finally comes to accept this Elizabeth as his mother, which later led to her suicide in 2000. The alternate version of Elizabeth is alive and well. When Peter returns to his home universe in "Over There", she is amazed to see him and bonds with him. In the corrected timeline of season four, Elizabeth in the prime universe committed suicide shortly after losing her own Peter, and Walter failed to save the other Peter. Meanwhile her parallel universe counterpart continued to stay living, and also remained married to Walternate, who appeared to be estranged from her in the previous timeline. Peter ventures to her home in an attempt to have her convince Secretary Bishop to help him return to his timeline. She recognizes him for who he is, and agrees to take him to Secretary Bishop. In the following episode, she uses the Bridge to visit Walter in his Harvard lab. They have a lengthy conversation in which she forgives him for taking her son, and that