BLAST FROM THE PAST – Liam’s (guest star Jason Gedrick) shocking history makes Cat (Kristin Kreuk) delve deeper into the Ellingsworth family, where she learns of their tragic past. Vincent (Jay Ryan) and Cat realize that they will need to use their secret weapon if they want to take Liam down. Meanwhile, JT (Austin Basis) has a theory about how to save himself but it involves none other than Liam. Nina Lisandrello and Nicole Gale Anderson also star. Jeff Renfroe directed the episode written by Gillian Horvath (#312).