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Evangelion Next Gen Testbed-04 (汎用ヒト型決戦兵器 人造人間エヴァンゲリオン 次世代試験4号機, "Hanyō Hitogata Kessen Heiki Jinzō Ningen Evangerion Jisedai Shiken Yongōki", lit. "General-Purpose Humanoid Battle Weapon Android Evangelion Next-Generation Test Unit Four").
Virtually nothing is known about the precise features of the Unit-04, since the details of it design were never specified in any publication like Evangelion 2.0: You Can (Not) Advance Complete Records Collection. One known major feature of the unit though, should it have been successfully completed, would have been its engine which would have given the unit an extensive, if not unlimited, operational time.
Evangelion Unit-04 was a test subject for the installation of an experimental engine at the second branch of NERV, in the southwest regions of Canada. This would have lead to extend the amount of operating time for the upcoming Evangelions. Unfortunately, a mysterious accident involving the engine occurred, which caused Unit-04, the second branch of NERV, as well as everything within an over 80-kilometer diameter to be obliterated in a massive explosion similar, but in lower scale, to the Second Impact, revealing a large energy cross rising from the sky to outer space.
Unit-04 role is very much similar as its NGE/EoE counterpart. It does have the same end. One major difference though is the fact that it is not considered a "Production Model" but rather a "Next Gen Testbed" unit in the Rebuild continuity (much like in the Neon Genesis Evangelion Proposal where the Unit-04 was labelled as a "Test Type" unit).
- In 2017, the Revoltech Evangelion Evolution EV-006 Evangelion Unit-04 figure was released, it was sculpted by Yamaguchi Katsuhisa and published by Kaiyodo. It was a recolor of the previous Unit-03 figure, and was given the phantom status just like Evangelion Unit 8+2, that appears in merchandising but not in the actual contents of the movie or published material. This release would contain 1 Spear of Longinus, 1 Pallet Rifle, 1 Progressive Knife, 1 umbilical cord and 12 optional hands.
- In Evangelion: 3.0+1.0 Thrice Upon A Time, all Evangelion units in the movie series are shown, except Evangelion Next Gen Testbed-04 and Evangelion Unit 8+2, which overall design remains unknown.