The Iron Star is one of the weapons of destruction used by the Iron Horde in Warlords of Draenor. The Iron Star was first seen used against Mannaroth during the cinematic intro.
I just watched the Battleship (film) and jaw-dropped when I saw the alien shredder weapon whirl up and get launched at the NAVY battleships. Exact copies of the Iron Star. The film was released on May 18, 2012 (USA). Warlords of Draenor shipped on November 13, 2014.