This article contains canon information corresponding to the Tales of Arcadia franchise. That means all information in this article is true and has appeared/been validated officialy on-screen.
Grand Theft Otto is the twenty eighth episode of Trollhunters.
Claire, Blinky, and Toby find out that AAARRRGGGHHH!!! 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.
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 AAARRRGGGHHH!!!