Despite being giant humans (in the series' broader definition of the term "human"), Evangelions are often mistaken for giant robots, but as early as Episode 02 Evangelion Unit-01 is seen without its helmet on, revealing that Evangelions are clearly not robots, but cyborgs, living organic creatures with cybernetic machine and computer components grafted onto them. They are also covered from head to toe in restraining metal plates that hide their true organic form and serve to keep them under NERV's control, and in part because they have pilots who sit in the cockpit-like Entry Plug .
Each episode has two titles: one is the original Japanese title, and the second is an English title that was chosen by Japanese studio Gainax itself. Most often, the official English title is not a direct translation of the Japanese title. For example, the direct translation of the Japanese title of episode 2 is "Unfamiliar Ceiling", but the English title is "The Beast". Sometimes, however, the two titles are either similar or exactly the same, as was the case with episode 10, "Magmadiver". Many tracks on the original soundtracks are named after the English episode names in which they are first used.