My idea for the second film is that it takes place 5 years after the events of the first. However, a new enemy known as "The Brick-Keeper" has been eliminating MasterBuilders around the worlds and only a lucky few survive. Those include Emmet, Wyldstyle, Batman, Spongebob, Harry Potter, Indy Jones, Kai (Ninjago) and Eris (Chima). The lucky 7 try to survive the events of the present day. With help of learning the history of Master Builders (Minifigures of 1960's-1970's, as they were brick built and A few other MasterBuilders from the past), the 7 stop the Brick-Keeper from eliminating them and in the end, train non-MasterBuilders just like Emmet was trained.