Gigantion, or Giant Planet, is a fictional planet home to giant Transformers in the animated television program, Transformers: Cybertron; it is referred to as Gigalonia in Transformers: Galaxy Force, the Japanese version of the show. Much like how Velocitron is referred to as both "Velocitron" and "Speed Planet", Gigantion has the same dual name. It's actual name was revealed in the episode "Balance". The Giant Transformers built cities underground and used holographic images of the sky on the top to make things nice. They started at the very center where they left the greenery.