With a little help from their future selves, Lucy and Wyatt, along with the rest of the team, journey to the California Gold Rush and the Korean War's Hungnam evacuation in a daring bid to save Rufus and stop Rittenhouse once and for all.
Lucy's situation grows desperate after she's taken captive by Flynn and brought to the 1893 Chicago World's Fair. In their dogged pursuit of Lucy, Wyatt and Rufus fall into a sinister trap.