Marvel's latest miniseries, Agatha All Along, is a spin-off of WandaVision. Recently released on Disney+, it is based on Agatha Harkness, the witch last seen in WandaVision.Agatha All Along recently released its sixth episode,

She's been Agatha all along, but Teen definitely hasn't been Billy all along. In "Agatha All Along" Episode 6, we learned exactly how long Wanda's son has been around in Eastview — and the answer is,

Hi, yes, hello! It's another week, and that means another incredible episode of Agatha All Along. Episode 6 — titled "Familiar by Thy Side" and directed by Gandja Monteiro and written by Jason Rostovsky — had us go back in time to see William Kaplan's (Joe Locke) origins and how he ultimately became Billy Maximoff.