William "Bill" Cadogan, also known as the Shepherd was the founder and leader of the Second Dawn doomsday cult and is now the supreme leader of the Disciples attempting to take the test to determine the fate of the human race.

Grace Cadogan calls Bill a narcissist with sociopathic tendencies, something that he doesn't deny, stating that it's the nicest thing that Grace has said to him in two years. However, Grace states that despite this, he does care about the people dying in the Nuclear Apocalypse even if he doesn't show it

Bill tore through Madi Griffin’s mind to get to the Judge and ultimately left her physically and verbally unresponsive but still aware, in Clarke’s eyes Bill killed her adopted daughter and hence Clarke pursued him and followed him into the testing grounds where she saw the Judge.

Everything Bill worked towards came to pass and both him and Clarke stood in judgement. Though before Clarke could kill Bill, the Judge disarmed her in an all too familiar form.

Bill rolled his eyes hoping the Judge would take Callie’s form yet being upstaged by Clarke and now the Judge appeared as Lexa, Clarke’s “greatest love”

Clarke’s lips quivered Lexa?

Bill began a monologue which involved worship, justification though somewhat unintentional, talks of transcendence and so on. All the while Clarke cried in The Judge’s/Lexa’s arms overwhelmed by grief over Madi who she would have to mercy kill mixed with grief over Lexa whose death the Judge’s form reminded her of, the Judge/Lexa’s rubbed Clarke’s back comfortingly

Bill eventually said Shall we converse now that I’ve rambled on awhile?