The War to End All Wars (S02E01)

Following a narrow escape from an explosion at Mason Industries, Wyatt and Rufus pursue the Mothership to a World War I battlefield in France to save Lucy from Rittenhouse. Upon arrival, they find that Lucy has enlisted the help of Marie Curie, the renowned scientist and two-time Nobel Prize winner, to aid a critically injured American soldier. However, they soon realize that this soldier is none other than Lucy’s great-grandfather, whom Rittenhouse intends to transport to the present to serve as their leader.