So, they literally blow up Warehouse 13 with a nuclear bomb. They kill off H.G. Wells, Mrs. Frederic and Walter Sykes. Some plot issues to point out. If Wells is able to generate a force field around Pete, Myka and Artie, why not just generate it around the bomb instead? And why didn't Pete and or Myka just shoot Walter? They clearly had the odds in their favor.

I really don't know how they are going to clean up this mess and reverse this. Perhaps H.G. Wells Time Machine? But I don't don't think that's a possiblity now that the Warehouse is history. Unless they were/are storing it at Wareshouse 12? 14?