With Alex Hirsch and the other crew members from the show.
Audio tracks taken from the Gravity Falls: The Complete Series: Collector's Edition distributed by Shout! Factory.
You can buy the 7 discs to watch it with the video track and support the show's creators on Shout! Factory or Amazon.
Participants: Alex Hirsch, Jason Ritter, Kristen Schaal, Mike Rianda, Robert "Rob" Renzetti, Alonso Ramirez Ramos, Matt Braly, Ariel Hirsch, Matt Chapman, Jackie Buscarino, Shion Takeuchi, Jeff Rowe, Brad Breeck.