On Halloween of 2007, Prudence is born to Jenevieve Sinclair and Klaus Hargreeves but Prudence is declared an anomaly and she is extracted from the timeline. Hardly a year later she is announced dead, shot beside her mother in a robbery gone wrong.
Then one day, Prudence reappears, no longer declared an anomaly and no longer dead. Rather, she had spent her childhood in and out foster care because her dad is labeled 'unfit' and when her latest foster family falls through, she is placed in Vanya Hargreeves' temporary care, where Prudence finds a semblance of a normal life.
When Vanya Hargreeve's adoptive father dies, Prudence is forced to go to the funeral, where the worst thing she thought could happen, is running into her father but that is overshadowed by the missing Hargreeves sibling crashing the funeral by returning from the future. A future that entails the impending apocalypse that he is determined to stop. And Prudence is at the top of his suspect list.