Origin The First is Orb's original form, when Gai first received the Orb Calibur from the Voice of Light. It was later upgraded into Orb Origin, which is able to wield the Orb Calibur in combat. This form is exclusive to Ultraman Orb THE ORIGIN SAGA.
Gai presses the trigger of the Orb Calibur and raises it towards the air. Origin The First soon appears from a red background and approaches the screen while the background changes colors and rings of light appear.
In the final episode of THE ORIGIN SAGA, Gai shouted Orb's name before he transforms, doing so in synchronization with his seniors.
The transformation can also be started involuntarily, being triggered by the Orb Calibur itself. It places a ring of light on Gai's chest (which becomes Orb's Color Timer), and he grows to larger size in a pillar of flowing light, becoming Ultraman Orb. This only happens in THE ORIGIN SAGA, during the first and last time Gai transforms in the series, and once in Ultraman Orb in a flashback Juggler had.