Venture Brothers – The Diving Bell vs the Butter-Glider
And this may be too referential, but I’m giving it a shot. These are the lost “sevens”. On Battlestar Galactica, the only Cylon model we never saw was number seven, although there was a backstory. (Besides “We screwed up the numbering at the very beginning and had to cover out tracks”.) The fact that Doc and Brock lost their number seven could be a BSG reference. It certainly seems like something they’d do, at any rate.