Also known as: グランゼボーマ
- Japanese:（グランゼボーマ）[Guranzeboma]
A mecha piloted by the Anti-Spiral during the last episode of Tengen Toppa Gurren Lagann. It was created to battle the Tengen Toppa Gurren Lagann mecha on even grounds.
- Visually, it resembles a black, skeletal version of Tengen Toppa Gurren Lagann.
- On the same way that Tengen Toppa Gurren Lagann is a manifestation of Spiral Power, Grand Zamboa is a manifestation of "absolute despair".
- Despite being an Anti-Spiral machine, it is capable of using drills as weapons; however, instead of having spiral grooves, the grooves are straight from the tip of the drill to its base.