In the animated movie Ultimate Avengers, based partly on The Ultimates but with several changes, Captain America uses a shield containing vibranium. In the Ultimate universe, Captain America used his triangular shield throughout World War II, only gaining the disc-shaped vibranium-bearing shield after he awoke in the present day. The composition of the triangular shield remains unrevealed. It did prove to be bulletproof against the bullets of World War II German soldiers, but was dented by a superhuman alien's punch.