The Sinestro Corps are a supervillian team that uses the power of fear. They are famous enemies of the Green Lantern Corps, who use willpower. The color of fear is yellow. The corps are led by Thaal Sinestro.
All Lanterns are powered by the Power Rings, and Yellow Lanterns are powered by the Yellow Lantern Power Ring.
Parallax is the embodiment of fear itself. Thousands of years ago he was imprisoned by the Green Lantern Corps, but he later escaped. Parallax is evil and will attack any hero, and being very strong, he can defeat many heroes easily. Users of the indigo light can copy his beam attack.