Who you gonna call? A to Z!
In Thursday's all-new episode, NBC's adorable freshman comedy gets in on the Halloween action with their very first costume-themed episode, "E is for Ectoplasm."
And for all you Ghostbusters fans out there, listen up! Ray Parker Jr., the genius who wrote and performed the theme song to the cult '80s classic, will also be guest starring in the episode, and we chatted with star Ben Feldman about all the spooktacular fun.
WATCH: We Spell Out Why You'll Love 'A to Z'!
"Ray Parker Jr. is in this week's episode which is really cool because he sang, 'Who're you gonna call? Ghostbusters!'" Feldman spilled to ETonline. "There's a whole lot of Ghostbusters in this episode… [HenryZebrowski and I] got to wear the cool Ghostbusters outfits and then Cristin [Milioti] and Lenora [Crichlow] dressed up as Laverne and Shirley, so it was a whole lot of fun."
Feldman added that it was a "magical moment" for him to step into the Ghostbusters costume, and he loves that A to Z's creator Ben Queen consistently treats fans with '80s throwbacks throughout the season. "It's so much fun," Feldman gushed. "I'm roughly the same age as our creator [Ben] so it's just a lot of callbacks to our youth and it happens about one an episode now."
PICS: How to Dress Like Your Favorite TV Characters For Halloween!
So far, each episode of A to Z has been eerily relatable for those in today's dating world, and Thursday's episode is definitely going to resonate with viewers with this touchy topic: What happens to the relationship with your best friend when you start dating someone new?
"There's an established history between [Andrew] and my friend and [Zelda] and her friend, and now this relationship has kind of disrupted all of those friendship transitions that everyone has and so of course conflict will ensue," Feldman answered. "I think this is the first time you see Stu and Stephie team up a little bit and agree on something even if it is being mad at us."
Take a look at our exclusive A to Z sneak peek video below to witness the beginning of a best friend cat fight between Zelda and Stephie as they try to figure out the dynamics of their friendship now that Zelda is in a relationship.
A to Z airs Thursday at 9:30 p.m. on NBC.