With the timeline barely stable, the Legends must tackle two anachronisms at the same time to try and keep Mallus at bay. Sara and Rip team up to stop Grodd from going after a particular target leaving Nate and Wally to stop Amaya from changing her future. Meanwhile, the Legends think they have found a way to destroy Mallus, but they will have to create an uneasy alliance with one of their enemies.
In the knockout rounds, Season 3's Cassadee Pope advises Team Kelly, Season 9's Jordan Smith advises Team Adam, Season 12's Chris Blue advises Team Alicia, and last season's Chloe Kohanski advises Team Blake. Each coach chooses the winner of their pairing to move on to the Live Playoff shows. In a new twist, the coaches have the opportunity to save one of their artists in addition to being able to steal someone that would otherwise go home.
Richard brings inspiration to all mini-breakers as he heads to Belgium with comedian Lee Mack, for culture, comics, puppets, waffles, mussels and pralines.
Under Dr. Simon's watchful eye, Rachel tries to help her father come off his medication; Jay delivers difficult news regarding his new show; Quinn and Chet decide to handle two of the contestants.