EVA-04 is one of the Evangelion Units featured in the anime series 'Neon Genesis Evangelion' (Shin Seiki Evangelion). Unlike other units, EVA-04 does not have a human pilot as a central character and is mostly referenced in the series rather than shown in action. It was constructed at a facility in the United States, but mysteriously vanished along with the entire facility during an experiment. Its disappearance plays a significant role in the narrative, highlighting the dangers of Evangelion technology.