Who Wants to Be a Millionaire?

S07E08 After, Before

As the Zephyr hurtles uncontrollably through time due to a malfunction in its drive, the team finds themselves facing imminent peril. Their best chance for survival rests with Yo-Yo, but there's a catch: to regain her abilities, she must seek the assistance of a former enemy and confront a long-buried chapter of her history.