Ep 1. Bad Teeth

Nick is back with his sidekick Hank to uncover supernatural enemies to maintain the peace in Portland town, but little did they know that they were up against a set of more dangerous Wesen. The season premiere episode "Bad Teeth" starts with Nick's return from his summer vacation with Juliette, but he soon realizes that things have changed in the town. Nick feels the town has become more perilous with the presence of people with mutated face and the town's peace is at stake.

Nick discovers that there are a set of Wesen who are immune to decapitation and makes them unkillable with any ordinary weapon. The episode takes an interesting turn when a new character Rosalee played by Bree Turner comes into the picture and gives insights into how these Wesen could be defeated.

The episode revolves around the investigation of a group of Wesen who are on the hunt for the most valuable possessions with mystical powers. The objects are said to hold supernatural powers that can turn their owners into all-knowing and powerful creatures. Nick and Hank team up with Rosalee to find the objects before the Wesen can get their hands on them and wreak havoc in the town.

Meanwhile, Nick is troubled by a new change in his body that makes him vulnerable to the Wesen's powers. Nick soon realizes that he needs to adapt his abilities to keep up with the new Wesen if he and Hank want to make progress against the latest threat.

The episode takes an intriguing turn when Nick encounters a Wesen that looks just like him, making him question his origins and whether he is the last Grimm. The episode also features a new group of Wesen that have never been seen before, adding a new layer of complexity to the plot. Additionally, the relationship between Nick and Juliette hits a rough patch as she tries to grapple with the truth about his secret life.

"Bad Teeth" is a gripping and engaging start to the second season of Grimm, setting the stage for the rest of the season. The episode's storyline is well thought out, and its new characters add depth and intrigue to the already complex storyline. The episode raises many questions that are sure to be answered in the coming episodes, making for an exciting season ahead.