The pilot for GR: Giant Robo. However, there were significant changes between the pilot and the actual show, including a different writer and a different director. Thus, the special is less a promo for the series than an alternate version of how the series might have looked.
Streaming availability for US region, via JustWatch.
Iron Man: Rise of Technovore
2013
—
Mobile Suit Gundam F91
1991
—
EVANGELION: DEATH (TRUE)²
1998
—
Code Geass: Akito the Exiled 2: The Wyvern Divided
2013
—
Mobile Suit Gundam III: Encounters in Space
1982
—
Patlabor WXIII the Movie
2002
—
Mazinger Z: Infinity
2017
—
Patlabor 2: The Movie
1993
—
Code Geass: Akito the Exiled 4: Memories of Hatred
2015
—
Gurren Lagann The Movie: Childhood's End
2008
—