The original character was created by John Broome and Gil Kane and first appeared in Green Lantern (Volume 2) #7.

This version of the character is exclusive to the continuity of the film Green Lantern and is an adaptation of Sinestro.

After witnessing Fear's power, Sinestro retrieved the yellow power ring that had been created earlier, he slipped his green power ring off his finger, and replaced it with the yellow ring, becoming the first Yellow Lantern. Sinestro commended Hal's achievements and told the Corps that the threat had been destroyed. His request, however, was denied so Hal had to defend his world on his own.ДЄfter leading Parallax towards the sun, Hal was about to be pulled into its core by gravity beacuse he was exhausted and it was too strong for him to fight, when he was saved by Sinestro, Kilowog, and Tomar-Re. Hal arrives and tells him not to use a yellow power ring because once corrupted by fear you cannot turn back, he requests that Sinestro and the Guardian's help him save the Earth from Parallax.

Sinestro suggested the Guardians should forge a yellow power ring containing energy from the essence of Fear and use it to defeat Parallax because he thought you can only fight fear with fear. Sinestro and a few other members of the Corps confronted Parallax but could not stop him.ДЄll the Green Lanterns who went on the mission were killed easily by Parallax except for Sinestro who refused to fight, seeing what happened to his fellow Corps members. Fueled with corruption and envy, Sinestro brought his thirst of darkness to eradicate members of the Green Lantern Corps, and unleashed his fear and takes advantage to gather dark energy to his dark cosmic entity, Parallax. This caused Hal to see himself unfit for the training and return to Earth. Thaal Sinestro is a korugarian male who serve once as a former member of the Green Lantern Corps, and the leader of the Sinestro Corps. When Hal Jordan arrives on Oa as Abin Sur's replacement, Sinestro is not pleased that he was a human stating that it disappointed him that Hal was wearing Sur's ring. Devastated by Sur's death he address the Guardians of the Universe.

Along with the rest of the Guardians' council, she allows Thaal Sinestro to guide a special squadron to try and defeat Parallax, but, when they fail, she gives her permission to create a Yellow. Sayd is a member of the immortal race of the Guardians of the Universe, Sayd is among the wisest leaders of the Green Lantern Corps. He now seeks to impose his own order and control onto the universe, employing a yellow power ring to combat the green he has grown to despise. Sayd is one of the Guardians of the Universe from the planet Maltus.

At one point the greatest member of the Green Lantern Corps, he was corrupted by his power and exiled for crimes against his own people. When Abin Sur was on his way to assist fellow Green Lantern Fentara, he was contacted by Sinestro who informed him that Fentara had been killed and warned him to be careful. Thaal Sinestro of Korugar is the arch-nemesis of Green Lantern.

Thaal movie