Fortress

Height: 3km (biggest Transtector)

A friend of Kup's, originally a Cyberdroid - a Transformer who has not yet mastered the art of transformation. Following the start of the war on Cybertron, him and his peers would escape to planet Master, whose hazardous environment and harsh conditions forced them to develop the Transtectors - a larger, sturdier body for which they could connect to, forming its heads.

He is the only Headmaster with a unique pattern to his transformation - his Transtector is actually the head of a giant robot.

He also wields the Master Sword (マスターソード), which he had forged for himself.

In the Japanese continuity's fiction, all three of his forms tend to be referred to as "Fortress", however the toyline and US continuity tend to make a distinction between the three, naming the smallest robot Cerebros, the middle stage Emissary, and the largest - Fortress Maximus.

In the Transformers GT manga, he takes on the alternate mode of a racecar, making him considerably smaller.