When Cole Barker (Jonathan Cake) escapes after being tortured by Fulcrum and returns to Castle, Sarah Walker and John Casey are assigned to hunt down a scientist (Robert Picardo) codenamed “Perseus”, who is the mastermind behind Fulcrum’s plans to build their own Intersect. Chuck Bartowski learns that a man codenamed “Orion” is the designer of the Intersect and headed the entire Intersect project. Meanwhile, Sarah wrestles with her feelings for Cole and Chuck, and Morgan tries to talk Anna out of moving in with him after previously agreeing to move in with Chuck. (From Wikipedia).

This episode was edited by Heidi J.