The Lion King Good vs. Evil

Scar plots to kill his family members here. Do we need to explain why that's evil?

Scar's power-hungry manipulations mark him as a truly evil and malevolent character.

Here, we can see how closely ambition—i.e., the desire for power—is linked to violence for Scar.

Scar says these words to Mufasa as he's throwing his brother off the sheer face of a cliff. At this point in the film, it looks as though evil is triumphing over good.

With her deep sense of responsibility and desire to restore good to the Pride Lands, Nala is a perfect interlocutor for the world-weary and insecure Simba. Sadly, it will be a while before the young prince is fully convinced to return home.

Nala is talking about the final battle between Scar and Simba—the one where the ongoing struggle between good and evil is finally settled.

Scar's power-hungry megalomania is beautifully described in this quote. He's in direct opposition to his brother, who only believed in doing what was right for his subjects.

Simba finally understands that it was Scar who killed Mufasa. This purges him of his guilt and makes it possible for him to defeat his evil uncle.

Simba says this to Scar after Scar confesses to Mufasa's murder. The young prince is clearly in support of the death penalty for murderers.

A final showcasing of Scar's evil: he shifts the blame whenever he can, trying to save his own hide by blaming the hyenas for his machinations.