Doraemon: Nobita and the New Steel Troops: Winged Angels(2011)

映画ドラえもん 新・のび太と鉄人兵団 ～はばたけ 天使たち～

Nobita and Doraemon find a giant robot in pieces which they later assemble. It turns out to be a destructive weapon and the gang must save Earth from an imminent invasion.