Not the same Luthor as the earlier post: L is for Lex Luthor. The earlier version I posted is not at all identical in sculpt to any of the other JLU (Justice League Unlimited) Lex Luthor action figures. This Lex Luthor has the more common head sculpt seen with the other Lex Luthor figures that have been released.
This particular JLU Lex Luthor 3.75" figure was released as a Supervillain 3-pack together with the Copperhead and Mirror Master action figures.
This is the garb that Lex Luthor wore when he formed the Injustice Gang (consisting of the Ultra-Humanite, Cheetah, Copperhead, The Shade, Solomon Grundy, and Star Sapphire) to destroy the Justice League in "Injustice For All", the 18th and 19th episodes of the "Justice League" animated series which first aired on September 6 and 13, 2002. Obviously they did not succeed.
Although a normal human, Lex Luthor possesses a keen intellect as well as a photographic memory. At his peak, his vast intelligence and technological know-how is matched only by notables such as Mr. Terrific and Bruce Wayne, though Lex is not quite as skilled a combatant.
He rarely wades into combat without some sort of weapon; be it a power suit, gun, or a chunk of Kryptonite to deal with Superman. Perhaps his greatest asset is his ruthlessness, as he will go to absolutely any end to get what he wants, regardless of the consequences.