When Jor-El travelled to Kandor to convince the Law Council to evacuate Krypton, General Zod declared his takeover of the planet and had Jor-El taken away. Kelex stopped Zod's men causing a distraction allowing Jor-El to sudbue the two as Kelex directed him to more approaching. Kelex then transmitted to Lara so Jor-El could inform her to begin launch preperations for Kal-El's Spaceship before it followed its master outside to witness Zod's forcing at war with Krypton.
After Jor-El died, Kelex accompanied Lara to Zod's trial where they were sentenced to the Phantom Zone.
Kelex and Kelor then stayed with Lara as Krypton imploded.
- Flight - Kelex's way of moving around is by flying
Kelex is able to transmit messages across Krypton to other service robots and devices through the use of its Metallic Liquid face.
- In most Superman comics, Kelex is the Kryptonian robot who looks after the Fortress of Solitude.