Thaal Sinestro is a fictional character, an alien supervillain in the DC Comics Universe. Created by John Broome and Gil Kane, Sinestro is the former mentor of Hal Jordan and the arch-nemesis of the entire Green Lantern Corps. Sinestro first appears in Green Lantern (vol. 2) #7 (July-August 1961). He is also revealed to be the father of his successor as Green Lantern, Soranik Natu, in Green Lantern Corps (vol. 2) #35 (April 2009). In 2009, Sinestro was ranked as IGN’s 15th Greatest Comic Book Villain of All Time.

The visual appearance of Sinestro was based upon British actor David Niven.”