User:HPZ - O.N.E./Sandbox/Evangelion Unit-04

Evangelion Unit-04 (4号機) was an Evangelion model developed in the United States. Unit-04 was a test subject for installing an S² Engine into an ordinary Eva, likely by using the one recovered from Shamshel. Unfortunately, there was an accident involving the S² Engine which caused Unit-04, the facility it was in, and everything within an over 80-kilometer diameter to be consumed by a Dirac Sea. While the S² Engine experiment was a failure, use of an S² Engine was later perfected for the Mass Production Evangelions. While Unit-04 is never seen in the series, promotional materials and other appearances make it appear to be a silver version of Evangelion Unit-03.

Neon Genesis Evangelion 2
In the Neon Genesis Evangelion 2 video game, alternate routes can be unlocked once certain conditions have been fulfilled. In one of these, Shinji does not kill Kaworu and instead convinces him to live. Kaworu will retrieve the Unit-04 from the Dirac Sea and eventually become its pilot.

In the PSP version of the game, Kaworu piloting the Unit-04 can take Shinji's place during the battle against Leliel. As in the anime, after the internal psycho-analysis, Unit-04 will then go berserk and tear apart the Angel.

Battle Orchestra
In "Battle Orchestra", Unit-04 is piloted by Kensuke Aida.