In the latest instalment, the Peep Show actor has a quick quibble with the set-up of Dragon's Den before getting his teeth into the meatier fare of ordering etiquette.
Talking from his CGI fishtank, Mitchell wants a push-button system (but NOT like the ones in Yo! Sushi).
New episodes of Soapbox are available to watch and download via YouTube, Facebook, iTunes, downloadable apps and other formats.
Meanwhile, sponsors ChannelFlip & Dell will launch a competition on July 6 to find the "next David Mitchell".
Winners of the contest will receive £10,000 and a year's development deal with ChannelFlip, including coaching with Mitchell himself.