Main article: Alpha
A True Alpha is a werewolf who rises to Alpha status solely on the strength and purity of their character, sheer force of will. True Alphas are rare, only appearing once in a 100 years.
One cannot rise to this status if they ever take a life, as discussed by Scott and Ms. Morrell in The Girl Who Knew Too Much.
A True Alpha's status cannot be stolen, usurped were they to be slain as in the manner of a regular Alpha, nor can their power cannot be absorbed, siphoned by anyone - except for a Beta of their own making.
In Season 3, Scott McCall's eyes, during situations of high duress but immense determination, briefly turn Alpha red.
In Currents, Dr. Deaton confirms Scott has the potential to be a True Alpha.
In Lunar Ellipse, Scott gains the Alpha rank by determinedly pushing through a mountain ash barrier, successfully breaking it, fully awakening his True Alpha status.