The Kroloteans are a fictional extraterrestrial race existing in the DC Universe. They first appear in Green Lantern #4.
Kroloteans
Hector Hammond is a supervillain appearing in American comic books published by DC Comics who is primarily an enemy of Green Lantern.
Hector Hammond Interior artwork from Who's Who: The Definitive Directory of the DC Universe 10 (December 1985 DC Comics) Art by Gil Kane
Peter Sarsgaard as Hector Hammond as he appears in Green Lantern.