Teen is a major character in Agatha All Along. Played by Joe Locke, he is referred to as Teen due to a sigil preventing him from revealing any identifying information. He finds Agatha in Westview to help her break free from Wanda's spell. His deep interest in witchcraft makes him revere Agatha and ask to go down the Witches Road. From then on, the Teen acts as a "familiar" - an assistant to Agatha's coven. When his powers manifest, he's revealed to be Billy Kaplan, who died in a car accident and obtained the soul of Billy Maximoff - the son of Wanda and Vision.

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