"Grimm" Season 4, Episode 2, titled "Octopus Head," airs on Friday, Oct. 31, on NBC. This Halloween special has a treat for the avid viewers of the series: another fierce hexenbiest. Meanwhile, the "octo wesen" is still out there, but Nick and Trubel are not letting him go.

Spoiler alert: This update contains Grimm Season 4 spoilers. Read at your own risk if you have not watched the new season premiere or seen the Grimm 4x2 promo video.

"Nick ponders whether he wants his Grimm abilities back as he and Hank continue to track a Wesen that's stealing memories from its victims. Meanwhile, Adalind learns she has a connection to Nick; and a recovering Capt. Renard has a mysterious visitor," reads the Grimm Season 4, Episode 2 synopsis on TV.com.

Adalind (Claire Coffee) is a no-show in the premiere episode of Grimm Season 4, but she is expected to have more screentime in Episode 2. And she might not be the only fierce mommy hexenbiest in the show. The abovementioned "mysterious visitor" is believed to be Captain Renard's mother, portrayed by Louise Lombard.

Viktor Albert Wilhelm George Beckendorf, aka Viktor (Alexis Denisof), is showing up again in Grimm Season 4, Episode 2. He wants to frame Nick for Weston's death, fearing the wrath of the king. On top of that, he has to let the king know that his beloved son is fighting for dear life.

Captain Renard's father, King Frederick (Dan Kremer), is human, like his half-brother Eric. His mother, however, is a hexenbiest, as revealed earlier in the series. It seems the time has come to introduce her in the show.

In the Grimm Season 4, Episode 2 promo video, Louise Lombard's mystery character is heard saying the way to beat a hexenbiest is to have her fight another hexenbiest, like herself.

Grimm Season 4 has a lot to offer its viewers, executive producer David Greenwalt told Zap2it.com.

Adalind will "rise from the ashes like you've never seen her before," Greenwalt said, adding there will also be some explanation for "why some people hear voices and think they are losing their minds, thinking they are schizophrenic."

As for the only grimm now (pending Nick's re-grimming), Trubel "will be in 'the first several'" episodes, and after Season 5, "(m)aybe Trubel has her own show in New York or Philadelphia." This sounds like a spin-off talk, hinting Grimm could go there in the future.

WATCH: Grimm Season 4, Episode 2 Preview | NBC on YouTube ('Octopus Head')