The Inadvertent Curse Case

S1, E1: Wolf approaches Peter in the street, asking for help. Peter is shocked to see a talking wolf, but he agrees anyway. Wolf is looking for something to scare away a ghost. Peter's got an ultrasonic generator just for the job. Wolf takes Peter to a parallel world, where they try the generator, but to no avail. The Raven tells Wolf it is not a ghost but a curse.