What type of energy corrupts Sinestro in Lanterns?

Yellow energy associated with fear corrupts Sinestro in Lanterns.

The series describes Thaal Sinestro as a former Green Lantern who went rogue after yellow energy connected with fear consumed him. This event helps explain his fall from respected Corps member to dangerous former mentor.

Sinestro’s history is especially important to Hal Jordan, whom he once mentored. The character therefore represents both the promise and the danger of power within the Green Lantern mythology.

Lanterns uses the idea of colored energies as part of its larger comic-book lore, but its main plot remains grounded in a murder investigation on Earth. Sinestro’s corruption provides a cosmic background to the series’ human-scale mystery.