The special will take place following the events of The Rise of Skywalker as Poe Dameron and BB-8 make an emergency landing on the volcanic planet of Mustafar.
Poe encounters Graballa the Hutt there who has purchased Darth Vader's castle and is turning it into a luxury hotel inspired by the Sith. Poe, BB-8, Graballa, her mechanic Dean and Vader's loyal servant Vaneé then venture deep into the castle where Vaneé shares three creepy stories.
Hale is voicing Vaneé with Slater voicing a character named Ren.
Co-stars include Jake Green as Poe, Dana Snyder as Graballa, Raphael Alejandro as Dean, Trevor Devall as Emperor Palpatine, Mary Elizabeth McGlynn as NI-L8 and Matt Sloan as Darth Vader.
Disney+ also released the first poster for the special, which features a mysterious character rising from a grave with a red lightsaber.
David Shayne penned the script and is an executive producer. Ken Cunningham is serving as director.
Lego Star Wars Terrifying Tales is a part of Disney+'s Hallowstream celebration. Disney+ previously released a Lego Star Wars Holiday Special in November.