Highway of Tears

S4 E6: The justification for Nick (David Giuntoli) to become a Grimm again is made much clearer in the wake of the most recent attack against Monroe (Silas Weir Mitchell) and Rosalee (Bree Turner). At work, Nick and Hank (Russell Hornsby) are called to a stretch of highway that acts as a staging area for a horrifying Wesen ritual. In Vienna, Viktor (guest star Alexis Denisof) meets with a completely broken Adalind (Claire Coffee), now ready to be of assistance in finding and retrieving the baby. Meanwhile, Trubel (guest star Jacqueline Toboni) is surprised by the sudden arrival of an old friend.