|"You four have merely scratched the surface of your full potential."
After Lord Garmadon raised the Island of Darkness from the sea, The Overlord led him to the Celestial Clock on top of No Man's Bluff, and told him to take the Helmet of Shadows, which allowed the Celestial Clock to begin its countdown. The Overlord later told Lord Garmadon that their ultimate weapon would be ready just in time for the final battle, as dictated by the Celestial Clock. Garmadon then placed his old helmet in its place.
The ticking Celestial Clock is briefly shown.
At the suggestion of Misako, the ninja attempted to halt the countdown by stealing the Helmet of Shadows from Lord Garmadon and returning it to the Celestial Clock. Unfortunately, they were unable to find the Helmet's pedestal in time, replacing it moments after the countdown finally finished. The Celestial Clock proceeded to release beams of energy between the many spheres orbiting its core, eventually firing the ray straight into Lord Garmadon's camp. As the Overlord gloated about the imminent victory of darkness over light, the Garmatron began to take shape within the energy beam of the Celestial Clock.
Before the Tournament of Elements
Sometime later, Chen succeeded in taking a piece of the Celestial Clock and displaying it in his Hall of Fame.