Warehouse 13 Season 3 Episode 12 (10/03/11)
Steve leads the team to a hanger, where he is found dead.
Pete and Myka follow Sykes to Hong Kong, where he’s kidnapped H.G. and forces her to open the Regents quarter which is essentially a backdoor to the Warehouse.
Sykes infiltrates the Warehouse and gets his artifact back, but Pete is able to stop him before he hurts anyone else.
As a going away present Sykes strapped a nuclear bomb artifact to the bottom of his wheelchair. Pete, Myka, and Artie desperately try to diffuse it but can’t.
H.G. in a final act of heroism creates a barrier around the three of them as the bomb explodes taking her and the entire Warehouse out.
As the Warehouse goes down in ruins Mrs. Frederick collapses and shrivels up, ending her life.