[WARNING: THIS ARTICLE CONTAINS SPOILERS]
Pacific Rim: Uprising is a good middle-chapter story that at once bridges with the past, while also setting up the future of the franchise. Now that the sequel is finally here, talk amongst fans that have seen it has inevitably shifted to what could happen in the threequel.
Pacific Rim 3 is poised to be a refreshingly novel and an exciting end to the amazing trilogy of giant robots vs. giant monster action.
In Pacific Rim: Uprising, we learn that the Kaiju leaders The Precursors had never given up on their planned invasion of Earth. The Precursors find a route back to Earth via the mind of Dr. Newt Geiszler (Charlie Day), who becomes susceptible to their influence after making a neural link with a Kaiju brain during the first film. This allows the Precursors to carry out a scheme carefully plotted over a decade.
Through Newt, the Precursors are able to integrate Kaiju biology and Jaeger mechanics, creating hybrid monsters like the Obsidian Fury, the mysterious Jaeger that attacks and kills Mako Mori (Rinko Kikuchi). Newt corrupts the Jaeger drone program of Shao Industries where he works, creating an army of Kaiju/Jaeger hybrids for a specific purpose: re-opening the breach between worlds.
It seems as though the story angle for Pacific Rim 3 has been established: Earth’s PPDC forces (and their Jaegers) open a breach to the Kaiju world and go there with the intent of getting the Precursors, before the Precursors find a way to take out Earth.