Nick is anxious to become a Grimm again in light of the attack on Monroe and Rosalee; at the same time, he and Hank are called to a stretch of highway that acts as a staging area for a horrifying Wesen ritual. Meanwhile, the sudden arrival of an old friend surprises Trubel; and in Vienna, Viktor meets with a completely broken Adalind.
John is forced to put aside his misgivings about exorcising a child when a malevolent spirit takes hold of a young boy. But first, the kid's parents need to be convinced that there is an evil presence controlling their son.
Martin Short; Coco Rocha; Simon Rich.
Wyatt Cenac; Margaret Brown. Also: Porter Robinson performs.