Lex joins an experimental program involving memory, hoping to recover information about his father's past.
While Carlos struggles emotionally, he and Kiera must stop Liber8 from unleashing a chemical attack on the city.
After buying an old reel-to-reel recorder at a garage sale, Jennifer discovers that it includes the sound of a man pleading for his life.
Kyle and Megan must weather a huge rumour that threatens to upend both their careers; Terence learns something surprising about DeAnn.
The Legends struggle with their consciences when they find out they must kill a 14-year-old boy in order to save the world.