Recently a few posts have been going around regarding a possible Adventure Time special that may be in the works at Cartoon Network. I’ve decided to try and collect everything we know in one place.

First of all, Rumble Jaw is not the actual name of the episode/special/whatever this turns out to be. It’s a codename being used at Cartoon Network. We first learned about Rumble Jaw’s possible connection to Adventure Time from the comments section of a blog belonging to Steve Hulett, a veteran of the animation industry. These comments were posted back in July, but it wasn’t until Tumblr user Digamma-F-Wau posted a screenshot of the conversation to their own blog in early September that people began to take notice. It was quickly reposted to Reddit and rumours have been circulating ever since then.

In the comments section, Steve Hulett claims the following:

“From my spies and stoolies… "Rumble Jaw” is a Special. It’s based on the characters from Adventure Time.“

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Hulett is very well respected in the industry for his leadership position in the Animation Guild, so I don’t think he would consciously lie about this. However, leaks often turn out to be the result of miscommunications so this should not be taken as irrefutable proof of an Adventure Time special. Additionally, the specific wording ”based on the characters from Adventure Time“ leaves it open to interpretation whether this will be an actual canon Adventure Time story or instead some kind of crossover event or non-canon instalment to the franchise.

So far we know of two people confirmed to be working on Rumble Jaw; Jennifer Goldberg and Iggy Craig.

Jennifer Goldberg has previously worked as a character designer for several cartoons including Pendleton Ward’s Bravest Warriors, and more recently was employed as art director of Enter the Florpus, the new Invader Zim movie. Her LinkedIn profile now lists her as art director on Rumble Jaw.

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Incidentally, this is also how we know that ”Rumble Jaw“ is a codename.

Iggy Craig (previously Anna Craig) was a storyboard artist on OK K.O.; a show which as you probably know was created by Adventure Time alumnus Ian Jones-Quartey. Craig states on their website’s about page that they are currently working as a storyboard artist on Rumble Jaw.

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There have also been some vague hints from the show’s cast regarding new Adventure Time content.

John DiMaggio, the voice of Jake the Dog, mentioned on the 2 May episode of the podcast Thick Skin with Jeff Ross that ”they were thinking about doing something with Adventure Time again“, but it didn’t sound as though he had actually done any voicework at that point. Additionally, this could have been referring to the Brawlhalla crossover which hadn’t yet been announced at that time.

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More recently Tom Kenny, the voice of Simon/Ice King, allegedly revealed to an attendee at a fan meeting on 14 September that he was recording lines for an ”Adventure Time hour long special“. However, the only source for this claim is a single Reddit post with no audio evidence, and as always this could have been a miscommunication.

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There has been much speculation about what this new special, if it exists, will be about. Some are speculating it could be aired to coincide with the tenth anniversary of Adventure Time, in April 2020. With NYCC starting in a couple of weeks, we might expect some kind of announcement there. However, I am going to manage my expectations until we have some official news. I believe that’s all we know at this time. If anything else comes up I’ll try to post about it.

TL;DR: We know for sure that a project codenamed ”Rumble Jaw“ is currently in the works at Cartoon Network. It may or may not be an Adventure Time special. Hopefully we will have an official announcement soon.