Yalexes are a species of gigantic creatures known for a rare item called a Yalexian Pearl. One yalex is battled on the moon of Krell.
A Yalex resembles an Earth spider but with a more straight body, almost cylindrical. It has four long legs and several blue-colored eyes. The particular Yalex that the Voltron Paladins encounter has a clouded eye that serves as a Yalexian Pearl.
- Yalex basically was an awakening beast that was fated to destroy the moon of Krell.