Here’s the official synopsis for episode 9 of Season 3, entitled Marionette.

When the Fringe Team investigates a case where a victim had his heart extracted, it’s just the beginning of a series of mysterious and reanimating events tied together. Meanwhile, Peter comes to terms with the reality of his relationship with Olivia.

Cast: Anna Torv as Olivia Dunham; Joshua Jackson as Peter Bishop; John Noble as Walter Bishop; Lance Reddick as Phillip Broyles; Blair Brown as Nina Sharp; Jasika Nicole as Astrid Farnsworth

Guest Cast: Mark Ivanir as The Gentleman; Anja Savcic as Amanda Walsh; Michael Bean as Grant Russo; Michael Coleman as Ben Killenburg; Barbara Tyson as Mrs. Walsh; Genevieve Buechner as Tabatha; Elizabeth McLaughlin as Dr. Alexandra Ross