"Invisible Walls" was a video blog-podcast created and hosted by editor-in-chief Shane Satterfield and run by the staff of GameTrailers with freelance journalist Marcus Beer, who originally came to the show on a biweekly basis as the ever-angry character "Grumpy McGrump", as co-host. The podcast was eventually hosted by editorial director Ryan Stevens after Shane Satterfield left GameTrailers after Episode 238. They were often joined by a rotating panel of GT editors including Justin Speer, Daniel Bloodworth, Michael Damiani, Patrick Morales, Chris Nguyen, and (formerly) Miguel Lopez. The show's debut episode was recorded on March 13, 2008 and published the following day. The podcast was a semi-round table discussion show in which the GameTrailers staff members discussed various goings-on in the video game industry, including new video game releases and controversies.