9. Drive

Before Simba was born, Scar didn't care much for anything, he could get by knowing Mufasa would probably die before him (Mufasa being older an' all) So he would get a chance to be King sooner or later. But, as soon as Scar heard the news that Sarabi had given birth to a boy...he was livid. Simba was that drive Scar had been lacking before he could take action agaisn't his brother.
(I used a ref for Scars colours and the background)