Invader Zim (lost 3D animation test sequence from Nickelodeon animated series pilot; 1999)
From The Lost Media Wiki
The Invader Zim pilot episode got completed in 1999 and later put as a special feature on the Volume 1 DVD. There was a 3D animation test done for the scene "Food Fight". Only screenshots have surfaced online. The video has still not been found. UPDATE: ThirstyGenie Found Another Screenshot!