A familiar foe comes to Jim's aid in the Darklands. Back in Arcadia, Toby's distracting new headgear picks up an important clue.
In this episode, a familiar foe comes to Jim's aid in the Darklands. Back in Arcadia, Toby's distracting new headgear picks up an important clue. Claire, Blinky, and Toby find out that AAARRRGGHH!!! holds the key to unlocking the bridge to the Darklands. But before that can happen, Claire and Toby must retrieve an antidote from the Janus Order, which is planning an army when Gunmar returns.
- Kelsey Grammer as Blinky
- Anton Yelchin as Jim Lake Jr.
- Charlie Saxton as Toby Domzalski
- Lexi Medrano as Claire Nuñez
- Jonathan Hyde as Mr. Strickler
- Clancy Brown as Gunmar
- Guillermo Del Toro as Dr. Muelas
- Mark Hamill as Dictatious
- Lena Headey as "The Lady Creator"
- Tom Kenny as Otto Scaarbach
- Laraine Newman as Miss Janeth
- Cole Sand as Eli Pepperjack
- Yara Shahidi as Darci Scott
- Lauren Tom as Nomura/Mary Wang
- Jimmie Wood as NotEnrique
- Steven Yeun as Steve Palchuk
- It is revealed that Strickler was part of a group of Changelings called "The Janus Order", which worships Gunmar and they were the ones who created the poison that cursed AAARRRGGHH!!!
- When Claire and Toby are being chased by members of the Janus Order, Jacques Offenbach's famed Galop Infernal from his operetta Orphée aux Enfers (Orpheus in the Underworld) is playing in the background.
- Title: The episode name is from the game called Grand Theft Auto.