Gravity Falls Unaired Pitch Pilot (2010)

On an unknown date, sometime between 2010 and 2012, animator Alex Hirsch began work on a pilot episode for what would soon become the hit Disney mystery series Gravity Falls. Created in Adobe Flash, the pilot ran for 11 minutes (as confirmed by Hirsch himself in a 2013 Reddit IAmA) and was a shorter version of the first official episode, "Tourist Trapped".

While not much background information on the pilot's creation have surfaced (besides the identities of those involved), a few screenshots and even a short 43-second snippet have managed to find their way online, along with a full outline of the episode (which is almost identical to that of "Tourist Trapped").

In the aforementioned Reddit IAmA conducted by Hirsch, when asked about a possible release for the pilot, he replied "Oh lord I hope not. That thing was a mess, haha! That would be like showing you awkward photos from my high school prom. We all have dark horrible secrets. That 11 minute Flash pilot was mine". Regardless, fans hold on to hope that it may one day be included as a DVD extra, or just flat-out released online.